added comment about 3rd party library usage and dependency

doc/CREDITS

@@ -15,4 +15,15 @@ contributors:
  
 additional credits goes to:
  - Joseph I. Valenzuela [OpenAL stuff]
- - Lev Povalahev [OpenGL Extensions]
+ - Lev Povalahev [OpenGL Extensions]
+
+The LWJGL project includes files from or depends on the following projects:
+ - OpenGL, SGI - http://opengl.org/
+ - OpenAL, Creative Labs - http://openal.org/
+ - FMOD, Firelight Technologies - http://fmod.org
+ - DevIL, <no company> - http://openil.sourceforge.net/
+ - jinput, Sun - https://jinput.dev.java.net/
+
+Please see the /doc/3rdparty/ directory for licenses.
+
+All trademarks and registered trademarks are the property of their respective owners.