Update README.md

README.md

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 # Current plugins for runluau.
 Builds directly into the build output folder of [runluau](https://github.com/plusgiant5/runluau) for fast testing.
 
+## How To Use Plugins
+Simply put them in the `plugins` folder and they will work. Plugins can do anything to the environment, but all of the plugins here register a global library to access their functions.
+A list of the functions the plugins here provide can be found in the [runluau env.d.luau file](https://github.com/plusgiant5/runluau/blob/main/external/env.d.luau).
+
 ## How To Create a New Plugin
 1. Copy `runluau-template`, and rename it.
 2. Rename `runluau-template.vcxproj`, `runluau-template.vcxproj.filters`, and `runluau-template.vcxproj.user` according to the name you chose.