Add Contributing to Skia section of docs

site/dev/contrib/index.md

+Contributing to Skia
+====================
+
+Here some ways you can get involved and help us improve Skia.
+
+
+Report Bugs
+-----------
+
+Find bugs to fix or report new bugs in the [Skia issue tracker](http://code.google.com/p/skia/issues/list).  
+You can also search the [Chromium issue tracker](http://code.google.com/p/chromium/issues/list) for bugs related to graphics or Skia.
+
+Test
+----
+
+Write an application or tool that will exercise the Skia code differently than our 
+current set of tests and verify that Skia works as expected.  Draw something 
+interesting and profile it to find ways to speed up Skia's implementation.  
+We cannot always fix issues or support every scenario, but we welcome any bugs 
+found so we can assess and prioritize them.  (If you find _and_ fix a bug, even better!)
+
+Contribute Code
+---------------
+
+Whether you develop a new feature or a fix for an existing bug in the Skia code base, 
+you will need a committer to review and approve the change.  There are some steps that 
+can speed up the review process:  
+Keep your code submissions small and targeted.  
+When possible, have a fellow contributor review your change in advance of submission.  
+Propose new features to the project leads by opening a feature bug or posting to 
+skia-discuss ahead of development.  For more information, see [How to submit a patch](./submit).
+
+For background on the project and an outline of the types of roles interested parties 
+can take on, see [Project Roles](../../roles).
+
+Anyone contributing code to Skia must sign a Contributor License Agreement and ensure 
+they are listed in the AUTHORS file:
+Individual contributors can complete the [Individual Contributor License Agreement](https://developers.google.com/open-source/cla/individual) online.  
+If you are contributing on behalf of a corporation, fill out the [Corporate Contributor License Agreement](https://developers.google.com/open-source/cla/corporate) 
+and send it in as described on that page.
+If it is your first time submitting code or you have not previously done so, add your 
+(or your organization's) name and contact info to the [AUTHORS file](https://skia.googlesource.com/skia/+/master/AUTHORS) as a part 
+of your CL.
+REVIEWERS: Before you LGTM a change, verify that the contributor is listed in the AUTHORS file.  
+If they are not, a Googler must ensure that the individual or their corporation has signed the 
+CLA by searching [go/cla-signers](https://goto.google.com/cla-signers).  
+Then have an entry added to the AUTHORS file with the CL.
+