docs/DeveloperPolicy: Add instructions for requesting GitHub commit access

Subscribers: mehdi_amini, jtony, xbolva00, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D66840

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@374474 91177308-0d34-0410-b5e6-96231b3b80d8

docs/DeveloperPolicy.rst

@@ -396,6 +396,26 @@ to do so.
 
 .. _discuss the change/gather consensus:
 
+Obtaining Commit Access to the GitHub Repository
+------------------------------------------------
+We are currently in the process of migrating the project's source code from SVN
+to a git repository on GitHub.  We are maintaining a file in SVN to map
+SVN usernames to GitHub usernames, so we can automatically grant access to
+existing committers when we complete the migration to GitHub.  In order to
+request commit access, check out the github-usernames.txt file in meta/trunk and
+add a line in the form of $SVN_USERNAME:$GITHUB_USERNAME and commit it.  For
+example:
+
+.. code:: console
+
+  mkdir tmp-llvm-svn
+  cd tmp-llvm-svn
+  svn co https://$SVN_USERNAME@llvm.org/svn/llvm-project/meta/trunk
+  echo "$SVN_USERNAME:$GITHUB_USERNAME" >> trunk/github-usernames.txt
+  cd trunk
+  svn commit -m "Request commit access for $SVN_USERNAME"
+
+
 Making a Major Change
 ---------------------