added dotenv for custom configuration

.env.example

@@ -0,0 +1,2 @@
+MEMORY_SIZE=0xFFFF
+START_POINT=0x0100

README.md

@@ -1,8 +1,15 @@
 # Introduction
+
 Hi, this is a very early WIP emulator for the gameboy handheld system, it is not gona be perfect, and is just a project i am working on own my own currently.
+
 # how to build and run
+
 Clone the project to a folder, open a terminal in the folder and type `npm install` 
 
+Configure the `.env.example` file as you want it or leave it as default
+
+Rename the `.env.example` to `.env`
+
 After npm has done its thing, you can run the tests if you feel like with `npm test`
 
 Build the project with `npx webpack`

package.json

@@ -5,7 +5,8 @@
   "private": true,
   "scripts": {
     "build": "webpack",
-    "test": "jest --coverage"
+    "test": "jest --config ./tests/jest.config.js",
+    "code-coverage": "jest --coverage"
   },
   "keywords": [
     "gameboy",
@@ -16,6 +17,7 @@
   "license": "ISC",
   "devDependencies": {
     "@types/jest": "^24.0.13",
+    "dotenv": "^8.0.0",
     "jest": "^24.8.0",
     "webpack": "^4.32.2",
     "webpack-cli": "^3.3.2"

tests/jest.config.js

@@ -0,0 +1,7 @@
+require('dotenv').config();
+/*{
+    module.exports = {
+        "collectCoverage": true,
+        "coverageReporters": ["text"],
+    }
+}*/

webpack.config.js

@@ -0,0 +1,7 @@
+const webpack = require('webpack');
+const dotenv = require('dotenv').config({path: __dirname+'/.env'});
+module.exports = {
+    plugins: [
+        new webpack.DefinePlugin({"process.env": dotenv.parsed})
+    ]
+};