Resolve "Create guides for contributing"

Closes #21 (closed)

added 4 commits

• d01f774d...0b47751a - 2 commits from branch master
• d866407d - Begin with guide for contributing, covering creation of test cases.
• 49b93404 - Use RelastTest for every test case now.

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added 1 commit

• 34850d12 - More on general process for issues, and on publishing

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added 1 commit

• 5783e7e8 - Adding table with command-line options.

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unmarked as a Work In Progress

assigned to @johannes.mey

Please "Delete source branch" and "Squash commits"

added 1 commit

• 0e664d95 - Update CONTRIBUTING.md

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enabled an automatic merge when the pipeline for 0e664d95 succeeds

mentioned in commit b039bd79

merged