Update README.md

Author: pwong-mapr

README.md

@@ -1,2 +1,15 @@
 # private-gitsync
 Scripting for synchronizing open-source repositories onto the MapR forks
+
+## How to add a sync entry
+
+1. Edit the script `git-to-git.sh`
+2. Go to the list of entries that show a lot of Git repositories
+3. Understand that each row is in the following format:
+   * Column 1: Original repository for the open-source project
+   * Column 2: MapR fork of the repository
+   * Column 3: short and convenient name for the project. This can be anything as long as it is a unique string.
+4. Insert the entry you want. Here is an example for HBase:
+   * `[email protected]:apache/hbase.git [email protected]:mapr/hbase.git hbase`
+   * `[email protected]:apache/hbase.git [email protected]:mapr/private-hbase.git private-hbase`
+5. Save your commit, and submit it as a pull request.