Add VERSIONING.md file

[jjbustamante]

This pull request adds a versioning.md.

The detail of how the versions are handled between branches was not added for now (CNB doesn't have a detailed definition either).

Fixes #1133

[codecov-commenter]

Codecov Report

Merging #1150 (dfed260) into main (bdf7d5a) will increase coverage by 0.01%.
The diff coverage is n/a.

❗ Current head dfed260 differs from pull request most recent head ad2277c. Consider uploading reports for the commit ad2277c to get more accurate results

@@            Coverage Diff             @@
##             main    #1150      +/-   ##
==========================================
+ Coverage   70.01%   70.03%   +0.01%     
==========================================
  Files         132      132              
  Lines        6677     6671       -6     
==========================================
- Hits         4675     4672       -3     
+ Misses       1573     1570       -3     
  Partials      429      429              

see 3 files with indirect coverage changes

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[jjbustamante]

@tomkennedy513 can we also merge this PR?