[P1BIGROCKS-1359] Update CONTRIBUTING guidelines and workflow
[P1BIGROCKS-1359](https://jira.il2.dso.mil/browse/P1BIGROCKS-1359)
## Problem Statement
Current implementation for accepting OSS contributions is not great and involves granting access for greatest flexibility
## Proposed Solution:
This was the solution = &226
## Task:
Update all of the project repos to include this [`contributing.md`](https://repo1.dso.mil/big-bang/bigbang/-/blob/master/CONTRIBUTING.md?ref_type=heads) file.
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