add a new scripts create-pull-request

This is the 1st version of create-pull-request script.
Using specified local commit-id or branch-name it
generates a short description of the changes;
and using poky-contrib branch-name it generates the
URL where these changes are already pushed
and are available for review and git-pull.

I prepared this script as per the input from Richard Purdie.

Signed-Off-By: Nitin A Kamble <nitin.a.kamble@intel.com>

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