Add documentation

README.md

@@ -1,5 +1,22 @@
 This tool tries to solve the "OpenGL" problem on nix.
 
+# Quick start
+
+Suppose you have a configuration with an nvidia card, host driver version `390.25`
+
+```
+# clone the repository
+git clone https://github.com/guibou/nixGL
+cd nixGL
+
+# build and install the wrapper
+nix-build -A nixGLNvidia --argstr nvidiaVersion 390.25
+nix-env -i ./result
+
+# use it with any OpenGL application
+nixGLNvidia blender
+```
+
 # Motivation
 
 You use Nix on any distribution, and any GL application installed fails with this error:
@@ -31,7 +48,7 @@ git clone https://github.com/guibou/nixGL
 cd nixGL
 ```
 
-## Optional (if NVIDIA) Grab your NVIDIA driver version
+## Optional (if NVIDIA): Grab your NVIDIA driver version
 
 Using `glxinfo` from your host system, grab the driver version, here `390.25`:
 
@@ -93,3 +110,16 @@ OpenGL version string: 4.6.0 NVIDIA 390.25
 # Limitations
 
 Does not work now for AMD drivers because I dont' have the hardware.
+
+# Comparaison with similar tools
+
+[nix-install-vendor-gl.sh](https://github.com/deepfire/nix-install-vendor-gl)
+provides a similar system with a different approach:
+
+- it auto detect the host driver
+- it needs root access and set your system for a specific driver
+- it only provides wrappers for nvidia (without bumblebee)
+
+Both projects are now really similar and the only reason I did not
+contributed to `nix-install-vendor-gl.sh` was because initial `nixGL`
+had a totally different approach.