adding readme

rescript/README.md

@@ -1,13 +1,30 @@
+# Gilded Rose
 
+This is the Gilded Rose kata in Rescript with Jest
 
-# Build
-```
-npm run build
+## Getting started
+
+Install dependencies
+
+```sh
+yarn install
 ```
 
-# Watch
+## Running tests
 
-```
-npm run watch
+To run all tests
+
+```sh
+yarn test
 ```
 
+To run all tests in watch mode
+
+```sh
+yarn test:watch
+```
+
+To start developing
+```sh
+yarn dev:rescript
+```