Adding NPM install in README

README.md

@@ -1,4 +1,4 @@
 # Use
 
-* Run ```npm run build``` to compute the code.
+* Run ```npm install``` and ```npm run build``` to compute the code.
 * Get in the root folder the website with an example of JSON inside.

package.json

@@ -5,9 +5,9 @@
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-		"prebuild": "mkdir images/ 2>/dev/null; true",
+    "prebuild": "mkdir images/ 2>/dev/null; true",
     "build": "html-inline -i src/index-notbundled.html -o index.html -b src/ --ignore-external",
-		"postbuild": "cp -n src/lessons.json.example lessons.json ; "
+    "postbuild": "cp -n src/lessons.json.example lessons.json ; "
   },
   "keywords": [],
   "author": "",