[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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