updates to the CLA section of Contributing.md

Author: DellaBitta

CONTRIBUTING.md

@@ -71,21 +71,35 @@ Also as a great rule of thumb:
 
 **If you get help, help others. Good karma rulez!**
 
-### Submitting a Pull Request
+## Before you Contribute
+
+### Sign our Contributor License Agreement
+
+Contributions to this project must be accompanied by a
+[Contributor License Agreement](https://cla.developers.google.com/about) (CLA).
+You (or your employer) retain the copyright to your contribution; this simply
+gives us permission to use and redistribute your contributions as part of the
+project.
+
+If you or your current employer have already signed the Google CLA (even if it
+was for a different project), you probably don't need to do it again.
 
-#### Before you contribute
+Visit <https://cla.developers.google.com/> to see your current agreements or to
+sign a new one.
+
+### Review our community guidelines
+
+This project follows
+[Google's Open Source Community Guidelines](https://opensource.google/conduct/).
+
+### Submitting a Pull Request
 
-Before we can use your code, you must sign the
-[Google Individual Contributor License Agreement][google-cla] (CLA), which you can do online. The
-CLA is necessary mainly because you own the copyright to your changes, even after your contribution
-becomes part of our codebase, so we need your permission to use and distribute your code. We also
-need to be sure of various other things, for instance, that you'll tell us if you know that your
-code infringes on other people's patents. You don't have to sign the CLA until after you've
-submitted your code for review and a member has approved it, but you must do it before we can put
-your code into our codebase. There is also a nifty CLA bot that will guide you through this process
-if you are going through it for the first time.
+All submissions, including submissions by project members, require review. We use GitHub pull
+requests for this purpose. Consult
+[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more information on using
+pull requests.
 
-Before you start working on a larger contribution, you should get in touch with us first through the
+If you plan to work on a larger contribution, you should get in touch with us first through the
 issue tracker with your idea so that we can help out and possibly guide you. Coordinating up front
 makes it much easier to avoid frustration later on. Some pull requests (large contributions, API
 additions/changes, etc) may be subject to additional internal review, we appreciate your patience as