Decision Records

[t2gran]

We have talked about adding (Architectural) Decision Records as a tool to keep track of important decisions taken in developer meetings about design and architecture. This PR contain:

• Process documentation and requeierments
• A initial Decision Record log
• Template for Decision Records

• Updated documentation

  This PR replace #5360. It is created based on the the OTP main repo not Entur repo to allow other users to commit to the repo branch. All comments in the old PR apply here as well, but we have not copied them over. Read the old issue and comments first and then this to get a chronological history of events regarding this PR. Sorry, for the inconvenience.

Closes #5360

[t2gran]

Note! There are many comment in the original PR, please copy over the notes if needed.

[leonardehrenfried]

I made a few tiny stylistic changes.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 69.45%. Comparing base (bd2eced) to head (a3fdb4b).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev-2.x #5932 +/- ## ============================================= - Coverage 69.46% 69.45% -0.01% + Complexity 17075 17073 -2 ============================================= Files 1937 1937 Lines 73717 73717 Branches 7546 7546 ============================================= - Hits 51204 51203 -1 - Misses 19882 19883 +1 Partials 2631 2631 ```

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