Updated README

Combine.bat

@@ -1,2 +0,0 @@
-@ECHO OFF
-COPY /B /Y .\src\Header.js + .\src\Cache.js + .\src\Config.js + .\src\Data.js + .\src\Disp.js + .\src\Main.js + .\src\Sim.js + .\src\Footer.js CookieMonster.js

Combine.sh

@@ -1,2 +0,0 @@
-#!/bin/sh
-cat ./src/Header.js ./src/Cache.js ./src/Config.js ./src/Data.js ./src/Disp.js ./src/Main.js ./src/Sim.js ./src/Footer.js > CookieMonster.js

README.md

@@ -63,6 +63,12 @@ If the bug is still here, you can submit an issue for it. Please do so by using
 
 All suggestions are welcome, even the smallest ones.
 
+## Contributing
+
+To contribute you can fork and clone the repository and run `npm install`.
+
+Please also remember to run `npm run build` after saving all your changes to build the final `CookieMonster.js` file. 
+
 ## Contributors
 
 * **[Raving_Kumquat](https://cookieclicker.wikia.com/wiki/User:Raving_Kumquat)**: Original author