Document installation and running for OCaml

ocaml/README.md

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+## Gilded Rose Kata for OCaml
+
+### Requirements
+
+To run the project, the following package must be available on your computer:
+- `opam` `>= 2.0`
+
+### Installation
+
+At the root of the _ocaml_ directory, execute:
+```sh
+opam switch create . --deps-only
+eval $(opam env)
+```
+
+It will install all the required dependencies for the project to run.
+
+### Running
+
+This project relies on `dune`. To build it, run this command in your terminal:
+```sh
+dune exec gilded_rose
+```
+
+### Testing
+
+The test suite is built with `Alcostest`. To launch the tests, just type:
+```sh
+dune runtest
+```