update readme with usage infos

Author: GregorBiswanger

ElectronNET-API-Demos/Startup.cs

@@ -56,7 +56,7 @@ public async void ElectronBootstrap()
             {
                 Width = 1152,
                 Height = 864,
-                Show = true
+                Show = false
             });
 
             browserWindow.OnReadyToShow += () => browserWindow.Show();

README.md

@@ -1,2 +1,20 @@
-# electron.net-api-demos
-Explore the Electron.NET APIs
+# Electron.NET API Demos
+This is a desktop app that interactively and with sample code demonstrates core features of the [Electron.NET](https://github.com/ElectronNET/Electron.NET) API. It's built with Electron, too, of course. This app works on Windows, macOS and Linux operating systems.  
+  
+Use this app to see what you can do with Electron.NET and use the source code to learn how to create a basic Electron.NET app.  
+  
+---  
+  
+## Using
+  
+You'll need [Node.js (v.8.x)](https://nodejs.org) and [.NET Core SDK](https://www.microsoft.com/net/download/core) installed on your computer in order to build this app.
+
+```bash
+$ git clone https://github.com/ElectronNET/electron.net-api-demos.git
+$ cd electron.net-api-demos
+$ cd ElectronNET-API-Demos
+$ dotnet restore
+$ dotnet electronize start
+```  
+  
+**Enjoy!**