Created Monitor renderers (markdown)

Monitor-renderers.md

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+One of the most FPS intensive parts of CC: Tweaked is its monitors. In order to reduce lag as much as possible, while remaining compatible with other mods, we provide two ways to render monitors.
+
+These can be changed through the `monitor_renderer` option in the `computercraft-client.toml` config file. 
+
+ - **Texture buffer objects (TBO):** This uses texture buffer objects and a custom shader to render the monitor. This is extremely fast, but not work when using Optifine or on older graphics cards.
+ - **Vertex buffer objects (VBO):** This is a more traditional renderer using vertex buffers. This is somewhat slower than TBOs for normal rendering, and significantly slower when monitors update. However, it is compatible with everything.
+ - **Best:** This is the default. It will use TBOs if the graphics card supports it, falling back to VBOs if needed.
+
+A more technical description of the various backends may be found [on this blogpost][blag].
+
+## Common problems
+
+### Monitors are partially white/transparent with shaders
+When using shaders, monitors may appear incredibly pale or transparent:
+
+![A transparent monitor](https://user-images.githubusercontent.com/4346137/80976751-b7f88480-8e1b-11ea-9637-e5649de918a3.png)
+
+This is a problem with how shaders work with the TBO renderer. Switching to the VBO renderer should fix it.
+
+[blag]: https://squiddev.cc/2020/05/08/monitors.html "An optimised monitor renderer"