Updated README

README.md

@@ -2,6 +2,24 @@
 
 An open source CS:GO map.
 
-Custom materials used in this map are available inside the materials folder. 
+Custom materials used in this map are available inside the materials folder. Do not forget to install them before attempting to compile it through Valve Hammer Editor.
 
-Do not forget to install them before attempting to compile it through Valve Hammer Editor.
+## Getting the map
+
+Build the map or download the [latest release](https://git.quent1.fr/quent1/de_abandoned_hospital/releases).
+
+## Building the map
+
+Open `de_abandoned_hospital.vmf` with Valve Hammer Editor (Counter Strike : Global Offensive SDK version). Press `F9` to compile, then select `Expert...` and choose the `Full compile -both -final (slow)` preset. Compilation will be way slower but it will ensure that the lightning of static props on the map are correctly rendered. 
+
+Once installed, do not forget to generate the navigation meshes file.
+
+## Generating the navigation meshes file
+
+Open the server console and execute : 
+
+	map de_abandoned_hospital
+	sv_cheats 1
+	nav_generate
+	
+Wait a few minutes until the file is generated. The server may become unresponsive during that generation.