Add screenshot & download links

Author: phpbg

readme.md

@@ -8,6 +8,14 @@ It is meant to be simple and easy to use.
 
 Although it is primarily meant for audio files, you can also use it to browse/watch videos or images. 
 
+![](screenshot.png)
+
+## Downloads
+* [Windows](https://github.com/phpbg/muspnp/releases/download/1.0.0-rc1/muspnp-1.0.0-rc1.Setup.exe)
+* [Linux deb](https://github.com/phpbg/muspnp/releases/download/1.0.0-rc1/muspnp_1.0.0-rc1_amd64.deb)
+* [Linux rpm](https://github.com/phpbg/muspnp/releases/download/1.0.0-rc1/muspnp-1.0.0.rc1-1.x86_64.rpm)
+* MacOS : builds are not provided, but you should be able to compile it easily (see [steps below](#build-instructions))
+
 ## Compatibility
 
 This is a list of servers and renderer known to work. Please send a MR to improve it.
@@ -34,6 +42,16 @@ Those features are not yet available:
 Logs are outputed if you run the program from the command line. You can redirect them to a file.
 * ex. on windows: `muspnp.exe > logs.txt`
 
+## Build instructions
+Install [Nodejs](https://nodejs.org) and [Git](https://git-scm.com/) before proceeding.
+```
+git clone https://github.com/phpbg/muspnp.git
+cd muspnp
+npm ci --no-optional
+npm run start
+rpm run make
+```
+
 ## Credits
 This software relies on a lot of great open source tools. Please review them within `package.json`