docs(codestyle): add empty code style document

[qdm12]

Changes

• Add empty code style document
• Reference it in readme
• Reference it in contributing document

The idea is to subsequently do PRs to that document, discuss them on the PR to see if we all agree on a new convention. If it is agreed, we might (only then) do code changes to make the code conform to it as part of this PR.

Tests

• No test

Issues

• No issue

Primary Reviewer

• Anyone, no hurry.

[noot]

maybe we should put WIP or something in the code style doc so people aren't confused that it's empty, haha

[codecov]

Codecov Report

Merging #1925 (558c318) into development (d71b524) will increase coverage by 0.02%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development    #1925      +/-   ##
===============================================
+ Coverage        60.46%   60.49%   +0.02%     
===============================================
  Files              185      185              
  Lines            18892    18892              
===============================================
+ Hits             11423    11428       +5     
+ Misses            5614     5612       -2     
+ Partials          1855     1852       -3     

Flag	Coverage Δ
unit-tests	60.49% <ø> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
lib/runtime/life/resolver.go	60.69% <ø> (ø)
dot/network/connmgr.go	78.76% <0.00%> (-0.89%)	⬇️
lib/babe/babe.go	51.04% <0.00%> (ø)
dot/network/service.go	70.43% <0.00%> (+1.15%)	⬆️
lib/babe/epoch.go	66.66% <0.00%> (+2.15%)	⬆️

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[github-actions]

🎉 This PR is included in version 0.6.0 🎉

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