instructions for how to contribute via Github. This closes apache#31.

git-svn-id: https://svn.apache.org/repos/asf/tika/trunk@1662175 13f79535-47bb-0310-9956-ffa450edef68

Author: chrismattmann

README.md

@@ -17,6 +17,27 @@ Tika is based on Java 6 and uses the [Maven 3](http://maven.apache.org) build sy
 The build consists of a number of components, including a standalone runnable jar that you can use to try out Tika features. You can run it like this:
 
     java -jar tika-app/target/tika-app-*.jar --help
+    
+Contributing via Github
+=======================
+To contribute a patch, follow these instructions (note that installing
+[Hub](http://hub.github.com) is not strictly required, but is recommended).
+
+```
+0. Download and install hub.github.com
+1. File JIRA issue for your fix at https://issues.apache.org/jira/browse/TIKA
+- you will get issue id TIKA-xxx where xxx is the issue ID.
+2. git clone http://github.com/apache/tika.git 
+3. cd tika
+4. git checkout -b TIKA-xxx
+5. edit files
+6. git status (make sure it shows what files you expected to edit)
+7. git add <files>
+8. git commit -m “fix for TIKA-xxx contributed by <your username>”
+9. git fork
+10. git push -u <your git username> TIKA-xxx
+11. git pull-request
+```
 
 License (see also LICENSE.txt)
 ------------------------------