new entry and a few updates on code dependencies

games/0ad.md

@@ -8,11 +8,16 @@ _0 A.D. is a free, open-source, cross-platform real-time strategy game._
 - Download: https://play0ad.com/download/
 - Keywords: real time, strategy
 - Code repository: https://github.com/0ad/0ad.git (mirror), https://svn.wildfiregames.com/public/ps/trunk/ (svn)
-- Code language: C++
+- Code language: C, C++
 - Code license: GPL-2.0
+- Code dependencies: SDL2, OpenAL, libvorbis, libogg, libxml2, zlib
+- Assets license: CC-BY-SA-3.0
 
 ## Building
 
+- Build system: Custom
+- Build instructions: https://trac.wildfiregames.com/wiki/BuildInstructions
+
 See [instructions](https://trac.wildfiregames.com/wiki/GettingStartedProgrammers)
 
 Has solution files for MSVC 2015, might also use premake.