More testing and examples

[electronstudio]

Convert more of the Raylib examples from C to Java and test they work.

[rolpon-cpp]

Please do add more examples. I'm messing around with shaders, and I have no idea how to manage or use these shaders properly. If you can provide more examples and documentation for the shader related functions, that would be amazing!

[electronstudio]

Shaders work exactly the same as they do in Raylib so you can refer to the Raylib documentation. Feel free to convert the Raylib examples and make a PR.