Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Weclome
+
+Thank you for taking interest in this repository and considering contributing! If you need to get setup with OCaml please follow the excellent instructions at https://ocaml.org/docs.
+
+## Installing Dependencies
+
+After cloning the repository and `cd`-ing into it, you should be able to run
+
+```
+opam install . --deps-only --with-test
+```
+
+which will install the dependencies of the project.
+
+## Building and Running the Tests
+
+We use `dune` as the build tool for this repository. To build the project you can run `dune build` and to run the tests use `dune runtest`.