Add updated version of old rules of engagement for core team

CONTRIBUTING_CORE.md

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+# CORE TEAM CONTRIBUTION GUIDE
+
+# 1. Transparency
+
+1.1 Use work logs for reflection of work done, aswell as telling your peers about changes that may affect their own tasks
+
+1.2 A work log SHOULD be submitted after a "unit of work" is complete.
+
+1.2.1 A "unit of work" should not span more than one full day's worth of work.
+
+1.2.2 A "unit of work" should be small enough that the log entries give useful insight.
+
+1.3 Individual logs are reviewed in weekly meetings
+
+<!--1.4 Bullet point list of topics and one or more sub-points describing each item in short sentences, eg;
+
+```
+- Core
+	* fixed foo
+	* fixed bar
+- Frontend
+	* connected bar to baz
+
+```-->
+
+1.4 Work log format is defined in []()
+
+1.5 Link to issue/MR in bullet point where appropriate
+
+1.6 
+
+
+# 2. Code hygiene
+
+2.1 Keep function names and variable names short
+
+2.2 Keep code files, functions and test fixtures short
+
+2.3 The less magic the better. Recombinable and replaceable is king
+
+2.4 Group imports by `standard`, `external`, `local`, `test` - in that order
+
+2.5 Only auto-import when necessary, and always with a minimum of side-effects
+
+2.6 Use custom errors. Let them bubble up
+
+2.7 No logs in tight loops
+
+2.8 Keep executable main routine minimal. Pass variables (do not use globals) in main business logic function
+
+2.9 Test coverage MUST be kept higher than 90% after changes
+
+2.10 Docstrings. Always. Always!
+
+
+# 3. Versioning
+
+3.1 Use [Semantic Versioning](https://semver.org/)
+
+3.2 When merging code, explicit dependencies SHOULD NOT use pre-release version
+
+
+# 4. Issues
+
+4.1 Issue title should use [Convention Commit structure](https://www.conventionalcommits.org/en/v1.0.0-beta.2/)
+
+4.2 Issues need proper problem statement
+
+4.2.1. What is the current state
+
+4.2.2. If current state is not behaving as expected, what was the expected state
+
+4.2.3. What is the desired new state.
+
+4.3  Issues need proper resolution statement
+
+4.3.1. Bullet point list of short sentences describing practical steps to reach desired state
+		
+4.3.2. Builet point list of external resources informing the issue and resolution
+
+4.4 Tasks needs to be appropriately labelled using GROUP labels.
+
+
+# 5. Code submission
+
+5.1 A branch and new MR is always created BEFORE THE WORK STARTS
+
+5.2 An MR should solve ONE SINGLE PART of a problem
+
+5.3 Every MR should have at least ONE ISSUE associated with it. Ideally issue can be closed when MR is merged
+
+5.4 MRs should not be open for more than one week (during normal operation periods)
+
+5.5 MR should ideally not be longer than 400 lines of changes of logic
+
+5.6 MRs that MOVE or DELETE code should not CHANGE that same code in a single MR. Scope MOVEs and DELETEs in separate commits (or even better, separate MRs) for transparency
+
+
+# 6. Code reviews
+
+6.1 At least one peer review before merge
+
+6.2 If MR is too long, evaluate whether this affects the quality of the review negatively. If it does, expect to be asked to split it up
+
+6.3 Evaluate changes against associated issues' problem statement and proposed resolution steps. If there is a mismatch, either MR needs to change or issue needs to be amended accordingly
+
+6.4 Make sure all technical debt introduced by MR is documented in issues. Add them according to criteria in section ISSUES if not
+
+6.5 If CI is not working, reviewer MUST make sure code builds and runs
+
+6.6 Behave!
+
+6.6.1 Don't be a jerk
+
+6.6.2 Don't block needlessly
+
+6.6.3 Say please