Add a description on how to contribute changes
Add a description on how to contribute changes

Change-Id: I61f1ecb0b035a6e5c7838f4cc35037c102870145
Reviewed-on: http://review.couchbase.org/20611
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>
Tested-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

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