ADD how to use section in README.md

README.md

 # simple lisplike shell
 ## How to use
+1. install system dependencies
+2. clone repo
+3. run `yarn` oder `npm install` from within the repo to install js dependencies
+4. run `yarn run start`/`npm start` to compile the grammar and run the interpreter OR
+5. just run the interpreter with `node index.js`
+
 System Dependencies:
+- git
 - node js
 - yarn/npm
 

package.json

@@ -11,7 +11,6 @@
     "pegjs": "^0.10.0"
   },
   "scripts": {
-    "start": "npx pegjs grammar.pegjs && node index.js",
-    "bundle": "npx parcel "
+    "start": "npx pegjs grammar.pegjs && node index.js"
   }
 }

run.sh

-
+#!/usr/bin/env bash
+npx pegjs grammar.pegjs && node index.js