add readme

README.md

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+# OCaml exercism exercises
+
+To set up the envirnoment run:
+```bash
+nix develop
+```
+
+To test a single exercise with dune:
+```bash
+dune test hello-world
+```
+
+## Configuring the exercism CLI
+
+First, get a token from exercism, than run:
+```bash
+exercism configure --token <token> --workspace /home/vladan/dev/exercism
+```
+
+## Using the exercism CLI
+
+Download an exercise:
+```bash
+exercism download --track=ocaml --exercise=hello-world
+```
+
+To test a single exercise open the folder and run test, e.g.:
+
+```bash
+cd hello-world
+exercism test
+```
+
+To submit solutions (from within the exercise folder):
+```bash
+exercism submit
+```