Create README.md for BrewingClass addon

Added initial README content for BrewingClass addon.

Author: glitchplaysgames714

README.md

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+# BrewingClass  
+### This is a [BreweryX](https://hangar.papermc.io/BreweryTeam/BreweryX) addon, not a plugin!
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+This is a addon for a [addon](https://hangar.papermc.io/BreweryTeam/Recipes-BreweryX-Addon) for [BreweryX](https://hangar.papermc.io/BreweryTeam/BreweryX) 
+THIS WILL NOT WORK BY ITSELF!
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+Using this addon you can teach your friends brewing recipes using ```/brew teach <recipe>```
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+please note that you actually have to own the recipe to teach it.
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+you need the permission
+```brewery.brewingclass.teach```
+so make sure to add it to your default group
+
+this is my first ~~plugin~~ addon so it will probally be scuffed as all hell.