Add GUI dev environment (#114)

Setup dev tools to build GUI using ReasonML + Electron

Use react-scripts instead of custom build config

Add electron command

Rename command

gui/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "gui",
+  "version": "0.1.0",
+  "private": true,
+  "main": "electron_app/index.js",
+  "homepage": ".",
+  "dependencies": {
+    "react": "^16.0.0",
+    "react-dom": "^16.0.0",
+    "reason-scripts": "0.6.11"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "electron": "electron ."
+  },
+  "devDependencies": {
+    "bs-jest": "^0.2.0",
+    "electron": "^1.7.9",
+    "electron-packager": "^9.1.0",
+    "reason-react": "^0.2.4"
+  }
+}