Adding useful Git commands to the api
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=16728) </details> <!--IssueSummary end--> Is it possible to implement few of Git commands in our api. For example: To show the first commit ``` git log --reverse or git rev-list --max-parents=0 HEAD ``` Ref: http://stackoverflow.com/a/5189296/230526 cc// @brodock
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