Merge pull request #10 from cccb/improve-binding-docs

Improve binding documentation

.gitignore

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 bin
 obj
 .direnv
+.envrc

CONTRIBUTING.md

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+# Contributing
+
+Contributions are accepted in any form (issues, documentation, feature requests, code, review, ...).
+
+All creatures welcome.
+
+## Pull requests
+
+Feel free to create a PR, even if your change is not done yet.
+
+Mark your PR as a draft as long as you do not want it to be merged.
+
+The main branch is supposed to be a working version, including language bindings,
+which means sometimes your PR may be merged into a temporary development branch.
+
+Unit tests and documentation are required for the core library.
+
+## Language bindings
+
+Pull requests for your preferred language will be accepted.
+If there is no code generator, it should call the C ABI methods provided by `servicepoint_binding_c`.
+It should be able to send most of the basic commands in a way the simulator accepts, receiving is
+not required for the merge.
+
+It is okay for the feature set of a language binding to lag behind the one of the rust crate.
+This also means you do not have to expose a feature to all the language bindings when adding something to the core.
+
+If your change may break other language bindings, please note that in your PR description so someone can check them.