Add warnings that the project is not actively maintained

.github/CONTRIBUTING.md

@@ -0,0 +1,17 @@
+## WARNING
+
+This is the repository of the original LWJGL, which is no longer actively maintained. Unless you have released a product that uses LWJGL 2.x, you should probably be looking at [LWJGL 3](https://github.com/LWJGL/lwjgl3).
+
+If you decide to proceed, it is very likely that:
+
+- LWJGL maintainers won't be able to address your issue. Your best hope is an external contribution, which happens very rarely.
+- Your issue is not an issue in LWJGL 3.
+- Your issue has already been fixed in LWJGL 3.
+
+If it is impossible for you to migrate to LWJGL 3, make sure to:
+
+- Describe your issue as clearly as possible.
+- Include information about your system/environment.
+- Include a minimal code sample that reproduces the issue.
+
+In any case, feature requests will almost certainly be ignored. If you need new features, you're very welcome to open an issue in the LWJGL 3 repository.

README.md

@@ -1,13 +1,17 @@
-LWJGL - Lightweight Java Game Library
+[LEGACY] LWJGL - Lightweight Java Game Library
 ======
 
+> **WARNING**
+> 
+> This is the repository of the original LWJGL, which is no longer actively maintained. Unless you have released a product that uses LWJGL 2.x, you should probably be looking at [LWJGL 3](https://github.com/LWJGL/lwjgl3).
+
 The Lightweight Java Game Library (LWJGL) is a solution aimed directly at professional and amateur Java programmers alike to enable commercial quality games to be written in Java. 
 LWJGL provides developers access to high performance crossplatform libraries such as OpenGL (Open Graphics Library), OpenCL (Open Computing Language) and OpenAL (Open Audio Library) allowing for state of the art 3D games and 3D sound.
 Additionally LWJGL provides access to controllers such as Gamepads, Steering wheel and Joysticks.
 All in a simple and straight forward API.
 
-Website: [http://lwjgl.org](http://lwjgl.org)
-Forum: [http://lwjgl.org/forum](http://lwjgl.org/forum)
+Website: [http://legacy.lwjgl.org](http://legacy.lwjgl.org)
+Forum: [http://forum.lwjgl.org](http://forum.lwjgl.org)
 Bugs/Suggestions: [https://github.com/LWJGL/lwjgl/issues](https://github.com/LWJGL/lwjgl/issues)
 
 Compilation