added contribution and governance documents

[edeyoung]

This pull request contains the shared repository governance document and contribution model to ensure easy collaboration between MITRE and the transition organization.

Pull requests into cqm-execution require the following. Submitter and reviewer should ✅ when done. For items that are not-applicable, note it's not-applicable ("N/A") and ✅.

Submitter:

• This pull request describes why these changes were made.
• Code diff has been done and been reviewed

Bonnie Reviewer:

Name:

• Code is maintainable and reusable, reuses existing code and infrastructure where appropriate, and accomplishes the task’s purpose

Cypress Reviewer:

Name:

• Code is maintainable and reusable, reuses existing code and infrastructure where appropriate, and accomplishes the task’s purpose

Before Merge

• Governance doc has been updated with company names as appropriate
• Governance doc has been updated with mailing lists, etc., as appropriate

[codecov-io]

Codecov Report

Merging #64 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #64   +/-   ##
=======================================
  Coverage   87.11%   87.11%           
=======================================
  Files           6        6           
  Lines         706      706           
  Branches      212      212           
=======================================
  Hits          615      615           
  Misses         91       91

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