Add two more HLS project ideas (#181)

Author: fendor

content/ideas/hls-more-cabal-plugin.md

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+---
+title: Haskell Language Server: Cabal Plugin Continuation
+---
+
+The [`hls-cabal-plugin`](https://github.com/haskell/haskell-language-server/tree/master/plugins/hls-cabal-plugin) is a Haskell Language Server (HLS) plugin that allows HLS to be a Language Server for `.cabal` files as well as Haskell files.
+While the plugin already provides many core features, there are more possible features that would increase the ergonomics of working with cabal files, such as:
+
+* Goto-Definition for local stanzas, such as library, executable or common stanzas
+* Integrating the [`cabal-add`](https://github.com/haskell/haskell-language-server/issues/3853) into HLS
+* Prompt to add unknown modules to `exposed-modules` and `other-modules` sections.
+* Completion of local and non-local package names
+* Completion of package version bounds
+* Showing documentation for keywords and enum values.
+
+With some creativity, we can come up with many more features.
+
+**Mentorship**
+
+Fendor
+
+**Difficulty and size**
+
+The difficulty of this project is medium, as there are two rather big existing projects that developers need to understand in order to provide improvements.
+
+The estimated size of this project is 175 hours, but there is likely 350 hours worth of work depending on the mentee's interests and ideas.
+

content/ideas/hls-test-suite-improvements.md

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+---
+title: Haskell Language Server: Test suite Improvements
+---
+
+Haskell Language Server (HLS) has an extensive test suite that is run on every commit.
+Over time, the test suite has degraded in performance, reliability and consistency.
+This has become a bottleneck in the development of HLS, as a slow and unreliable test suite deters new contributors and makes life more difficult for maintainers.
+
+This project aims to improve the quality of the test suite by:
+
+* Reducing the overall test suite execution time
+* Fixing flaky test cases
+* Removing artificial wait times in test cases
+* Unifying the style of tests in HLS
+
+The issue [#3736](https://github.com/haskell/haskell-language-server/issues/3736) provides some ideas on how to improve the test suite further.
+
+To achieve the aforementioned goals, some of the following intermediate steps could be helpful:
+
+* Unifying testing infrastructure of ghcide and plugins
+* Enabling parallelism of test case execution
+* Exploiting custom LSP messages to reduce flakiness of tests written in lsp-test
+
+**Mentorship**
+
+Fendor
+
+**Difficulty and size**
+
+The project itself is not too difficult, as there is lots of prior work and many low hanging fruits.
+However, there is a fair amount of working with the internals of Haskell Language Server which can be intimidating as they tend to be underdocumented.
+
+The size of this project ranges from 175 hours up to 350 hours, depending on the exact scope of the proposal.