Add basic documentation on how to contribute to Metacello [skip-ci]

Metacello / metacello

Metacello is a package management system for Smalltalk

MIT License

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Closed LinqLover closed 4 years ago

LinqLover commented 4 years ago

Description has been adopted from https://github.com/Metacello/metacello/pull/534#issuecomment-707302121 by @dalehenrich and enriched with examples for bash and Squeak by @LinqLover.