Add to readme and refine update.sh

README.md

 # gdpd
 
-Godot add-on for loading and processing Pure Data patches 
\ No newline at end of file
+Godot add-on for loading and processing Pure Data patches 
+
+
+# Compiling
+
+## Compiling on GNU/Linux
+
+- Open a terminal
+- Type the following commandes :
+	- git clone https://gitlab.univ-lille.fr/ivmi/gdpd.git
+	- cd gdpd
+	- ./update.sh linux
+
+## Compiling on Windows
+
+- Open the Windows Powershell
+- Type the following commandes :
+	- git clone https://gitlab.univ-lille.fr/ivmi/gdpd.git
+	- cd gdpd
+	- ./update.sh windows
+
+
+## Compiling on Mac OSX
+
+
+## Compiling for Android (/ Oculus Quest)
+
+
+## Compiling for the Web
+

update.sh

 #!/bin/bash
+git config --global url."https://".insteadOf git://
 git submodule update --init --recursive
 cd src/godot-cpp
-scons platform=$1 generate_bindings=yes
+scons platform=$1 generate_bindings=yes target=release
 cd ../..
-scons platform=$1
+scons platform=$1 target=release