[doc] Add codeclimate maintainabiltity shield and link to doc
Change-Id: Id3666b111aff9d03f77b9e73d551871fa7abe6ee
X
xqt committed
b21efb684fc930db36ce3ab231676dcacf7a9e76
Parent: f0a05aa
Change-Id: Id3666b111aff9d03f77b9e73d551871fa7abe6ee