Add OpenGL GLFW compute shader example

[lzzrhx]

Checklist before submitting:

• This example has been added to .github/workflows/check.yml (for automatic testing)
• This example compiles cleanly with flags -vet -strict-style -vet-tabs -disallow-do -warnings-as-errors
• This example the naming and style convention: https://github.com/odin-lang/examples/wiki/Naming-and-style-convention (exceptions can be made for ports of examples that need to match 1:1 to the original source).
• By submitting, I understand that this example is made available under these licenses: Public Domain and Odin's zlib license. Only for third-party dependencies are other licenses allowed.

[lzzrhx]

Not sure if it's preferable, but here's an alternate version of the example with font rendering and a depthbuffer texture included: https://codeberg.org/lzzrhx/template-odin-opengl-compute-shader

And here's two projects where I've used this set up:

• https://codeberg.org/lzzrhx/voxel-space
• https://codeberg.org/lzzrhx/ray-tracer