[WIP] Add CONTRIBUTING.md

[coditva]

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[codecov]

Codecov Report

Merging #13 into master will increase coverage by 1.28%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
+ Coverage   79.63%   80.92%   +1.28%     
==========================================
  Files          17       24       +7     
  Lines         388      456      +68     
==========================================
+ Hits          309      369      +60     
- Misses         79       87       +8

Impacted Files	Coverage Δ
tests/unit/components/MenuItem_spec.lua	100% <0%> (ø)
tests/unit/components/Console_spec.lua	100% <0%> (ø)
tests/unit/components/Menu_spec.lua	100% <0%> (ø)
components/Background.lua	58.82% <0%> (ø)
components/Console.lua	93.75% <0%> (ø)
tests/unit/components/Background_spec.lua	100% <0%> (ø)
tests/unit/states/Map_spec.lua	100% <0%> (ø)

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