MISC: Bootstrap main.js and Makefile

Makefile is here to not forget the commands and the --no-sandbox, electron not working otherwise.

MISC: Bootstrap main.js and Makefile
fc966f15 · Kubat · 689bf954 · fc966f15 · fc966f15 · fc966f15
--- a/Makefile
+++ b/Makefile
+prepare:
+	yarn install
+
+run:
+	yarn start --no-sandbox
--- a/README.md
+++ b/README.md
@@ -9,3 +9,9 @@ This readme is to be written
 # Prerequisites

 yarn (nodejs + electron)
+
+# How to
+
+To prepare or update: `make prepare`
+
+To run: `make run`
--- a/instance/index.html
+++ b/instance/index.html
+<body>
+    toto
+</body>
--- a/instance/main.js
+++ b/instance/main.js
+const electron = require('electron')
+const { app, BrowserWindow } = require('electron')
+
+function createWindow () {
+  // Create the browser window.
+  const win = new BrowserWindow({
+    width: 800,
+    height: 600,
+    webPreferences: {
+      nodeIntegration: true
+    }
+  })
+
+  // and load the index.html of the app.
+  win.loadFile('instance/index.html')
+}
+
+app.whenReady().then(createWindow)