Add a README

Note: The current COMPILING is now deprecated and will soon be removed

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+NetRadiant
+==========
+
+The open source, cross platform level editor for idtech games (NetRadiant fork)
+
+
+Getting the Sources
+===================
+
+The latest source is available from the git repository:
+https://gitlab.com/xonotic/netradiant.git
+
+The git client can be obtained from the Git website:
+http://git-scm.org
+
+To get a copy of the source using the commandline git client:
+  git clone https://gitlab.com/xonotic/netradiant.git
+  cd netradiant
+
+See also https://gitlab.com/xonotic/netradiant/ for a source browser,
+issues and more.
+
+Dependencies
+============
+
+ * OpenGL
+ * LibXml2
+ * GTK2
+ * GtkGLExt
+ * LibJpeg
+ * LibPng
+ * ZLib
+
+Compiling
+=========
+
+This project uses the usual CMake workflow:
+
+  mkdir build && cd build && cmake .. && make
+
+More Compilation Details
+------------------------
+
+CMake options:
+ * DOWNLOAD_GAMEPACKS=ON
+   Automatically download the gamepack data during the first compilation
+ * RADIANT_ABOUTMSG="Custom build"
+   A message shown in the about dialog
+
+Make targets:
+ * radiant    Compiles the radiant core binary
+ * plugins    Compiles all plugins (each plugin has its own target as well)
+ * modules    Compiles all modules (each module has its own target as well)
+ * game_packs Downloads the game pack data
+ * quake3     Compiles all the Quake3 tools
+  * q3map2    Quake3 map compiler
+  * q3data
+ * quake2     Compiles all the Quake2 tools (Note: needs to be compiled explicitly)
+  * q2map     Quake2 map compiler
+  * q2data
+  * h2data