Add Generate A Native ReasonML Project With Pesy as a reason til

reason/generate-a-native-reasonml-project-with-pesy.md

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+# Generate A Native ReasonML Project With Pesy
+
+[Pesy](https://github.com/jordwalke/pesy) is a CLI utility available from
+NPM that you can use to generate a ReasonML project that is ready for native
+compilation. It uses [`esy`](https://github.com/esy/esy) for the management
+of `opam` packages. It uses [Dune](https://github.com/ocaml/dune) for
+building your library code with the ReasonML and OCaml dependencies.
+
+Assuming you already have `pesy` installed globally, create a directory for
+your project and then run:
+
+```bash
+$ pesy
+```
+
+A project will be generated that is out-of-the-box ready to compile native
+executables.