RELEASES.md: document the releases policy
This adds a file to document the policy on releases based on the discussions taken place in the last face to face meeting.
https://gitlab.com/gnutls/gnutls/wikis/face2face-meeting-fosdem2019
Checklist
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Documentation updated / NEWS entry present (for non-trivial changes)
Reviewer's checklist:
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Any issues marked for closing are addressed -
There is a test suite reasonably covering new functionality or modifications -
Function naming, parameters, return values, types, etc., are consistent and according to CONTRIBUTION.md
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This feature/change has adequate documentation added -
No obvious mistakes in the code