Added contribution page

Author: Eric Findlay

contributions.md

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+---
+layout: default
+title: How To Contribute
+---
+
+# Contributing to Rust
+
+If you're learning Rust, you've no doubt been amazed at how awesome
+the language is and will be keen to write more Rust code. Hopefully,
+you'll also want to make a meaningful contribution to the community.
+If you're not sure how best to do that, then hopefully this page will
+help. Most of this page is filled with links to lists of issues to
+help you find something to work on. There are issues on the Rust
+project itself, a number of supporting projects, and some projects
+which are large users of Rust.
+
+Writing code isn't the only way to make a meaningful contribution.
+Writing tests and documentation is how many people get started and is
+really useful. There are links to these kind of issues too. Likewise
+finding bugs and filing issues in any of the projects linked here is
+very much appreciated. As a reminder, all contributors are expected to
+follow our [Code of Conduct][coc].
+
+[coc]: https://www.rust-lang.org/conduct.html
+
+## Finding Something to Work On
+
+#### Issues
+
+If you're looking for [issues][rust_issues] on the Rust repo
+and want something easy-ish to start with, look for the [E-easy][e_easy_issues]
+or [E-mentor][e_mentor_issues] labels.
+
+Contributors with sufficient permissions on the Rust repo can help by
+adding labels to triage issues:
+
+- **Yellow A-prefixed** labels state which area of the project an
+  issue relates to.
+- **Magenta B-prefixed** labels identify bugs which belong elsewhere.
+- **Green E-prefixed** labels explain the level of experience
+  necessary to fix the issue.
+- **Red I-prefixed** labels indicate the importance of the issue. The
+  I-nominated label indicates that an issue has been nominated for
+prioritizing at the next triage meeting.
+- **Orange P-prefixed** labels indicate a bug's priority. These labels
+  are only assigned during triage meetings, and replace the
+I-nominated label.
+- **Blue T-prefixed** bugs denote which team the issue belongs to.
+- **Dark blue beta-** labels track changes which need to be backported
+  into the beta branches.
+- **Purple** metabug labels mark lists of bugs collected by other
+  categories.
+
+[rust_issues]: https://github.com/rust-lang/rust/issues
+[e_easy_issues]: https://github.com/rust-lang/rust/issues?q=is%3Aopen+is%3Aissue+label%3AE-easy
+[e_mentor_issues]: https://github.com/rust-lang/rust/issues?q=is%3Aopen+is%3Aissue+label%3AE-easy+label%3AE-mentor
+
+#### The Rust compiler
+
+The compiler is part of the [main repo][main_repo], which also
+includes the standard library crates and a whole bunch of supporting
+code. For questions about the compiler, there is the
+[#rustc][rustc_irc] IRC channel. Compiler errors (ICE for 'internal
+compiler errors') can be searched for in issues using the
+[I-ICE][i_ice_issues] label. These are usually good bugs to start with
+because it's easy to know when you've fixed them, and they're often
+relatively self-contained. If you're interested in parsing, macros,
+syntactic stuff, the [parsing][parsing_issues] label and the
+[macro][macro_issues] label are a good places to start.
+
+[main_repo]: https://github.com/rust-lang
+[rust_irc]: irc://moznet/rustc
+[i_ice_issues]: https://github.com/rust-lang/rust/labels/I-ICE
+[parsing_issues]: https://github.com/rust-lang/rust/issues?q=is%3Aopen+is%3Aissue+label%3AA-parser
+[macro_issues]: https://github.com/rust-lang/rust/issues?q=is%3Aopen+is%3Aissue+label%3AA-parser+label%3AA-macros
+
+#### Standard Libraries
+
+[Libstd][libstd], [libcollections][libcollections],
+[liballoc][liballoc] and [libcore][libcore] are the main library
+crates.  These all appear to users as if they are part of libstd, the
+standard library. These tend to be very fundamental libraries -
+built-in types, low level IO and concurrency, allocation, essential
+collections, and so forth. You should join [#rust-libs][libs_irc] if
+you are interested in contributing to the Rust libraries.
+
+[libstd]: https://github.com/rust-lang/rust/tree/master/src/libstd
+[libcollections]: https://github.com/rust-lang/rust/tree/master/src/libcollections
+[liballoc]: https://github.com/rust-lang/rust/tree/master/src/liballoc
+[libcore]: https://github.com/rust-lang/rust/tree/master/src/libcore
+[libs_irc]: irc://moznet/rust-libs
+
+#### Cargo
+
+[Cargo][cargo_issues] is Rust's package manager.
+
+[cargo_issues]: https://github.com/rust-lang/cargo/issues
+
+#### Tests
+
+Contributing tests is extremely valuable to the Rust project. For the
+compiler and standard libraries, there are unit tests (usually)
+embedded in the source code and regression tests in the
+[src/tests][tests] directory. There is a list of issues which have
+(probably) been fixed, but still need a test. Nearly any other project
+will be extremely welcoming of new tests too.  Writing test cases is a
+great way to begin to understand a new project and get started
+contributing.
+
+[test]: https://github.com/rust-lang/rust/tree/master/src/test
+
+#### Checking Older Bugs
+
+Sometimes, an issue will stay open, even though the bug has been
+fixed. And sometimes, the original bug may go stale because something
+has changed in the meantime. It can be helpful to go through older bug
+reports and make sure that they are still valid. Load up an older
+issue, double check that it's still true, and leave a comment letting
+us know if it is or is not. The [least recently updated][lru_issues]
+sort is good for finding issues like this.  
+
+[lru_issues]: https://github.com/rust-lang/rust/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-asc
+
+#### Documentation
+
+Documentation is never good enough and there's never enough of it.
+Writing docs is a really valuable way to contribute to open source
+projects. Many aspects of the docs don't require super-deep knowledge,
+especially if they're aimed at newcomers. It's also a great way to
+learn more about the language or specific libraries.
+
+- [The Book][rustbook_issues] The main guide to learning Rust.
+- [Rust Documentation][rustdoc_issues]
+- [Rust by Example][rust_by_example_issues]
+- [Rust for C++ Programmers][rust_for_cpp_issues] A tutorial aimed
+at experienced C++ programmers coming to Rust.
+
+[rustbook_issues]: https://github.com/rust-lang/rust/issues?q=is%3Aopen+is%3Aissue+label%3AA-book
+[rustdoc_issues]: https://github.com/rust-lang/rust/issues?q=is%3Aopen+is%3Aissue+label%3AA-docs
+[rust_by_example_issues]: https://github.com/rust-lang/rust-by-example/issues
+[rust_for_cpp_issues]: https://github.com/nrc/r4cppp/issues
+
+#### Tools
+
+Tools play a huge part in the success of a language. Rust has some
+great tool support, in particular with debugging and package
+management, but we need much more.
+
+- [cargo](https://github.com/rust-lang/cargo/issues) Rust's package manager and build system.
+- [rustdoc](https://github.com/rust-lang/rust/issues?q=is%3Aopen+is%3Aissue+label%3AA-rustdoc)
+  Produces documentation for the official libraries and user projects.
+- [racer](https://github.com/phildawes/racer) Code completion.
+- [rustfmt](https://github.com/nrc/rustfmt) Code formatting.
+- [multirust](https://github.com/brson/multirust/issues) For managing
+  multiple installations of the Rust toolchain.
+- [homu](https://github.com/barosl/homu/issues) Acts as a gatekeeper for commits.
+
+#### Other Contributions
+
+Try [Github Trending][trending] for currently active Rust projects.
+There are a number of other ways to contribute to Rust that don't deal
+directly with the Rust repository.
+
+- Answer questions in [#rust][rust_irc], on the [Rust Forum][forum] or
+  on [Stack Overflow][stack_overflow].
+- Participate in the [RFC process][rfcs].
+- Find a [requested community library][requested], build it, and
+  publish it to [Crates.io][crates]. Easier said than done,
+but very, very valuable!
+
+[trending]: https://github.com/trending?l=rust
+[rust_irc]: irc://moznet/rust
+[forum]: https://users.rust-lang.org/
+[stack_overflow]: http://stackoverflow.com/questions/tagged/rust
+[rfcs]: https://github.com/rust-lang/rfcs
+[requested]: https://github.com/rust-lang/rfcs/labels/A-community-library
+[crates]: http://crates.io