Add readme

Author: RappyTV

readme.md

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+# **Toolbreak Warning**
+![Downloads](https://labybadges-delta.vercel.app/api/downloads/rainbowgui/formatted)<br>
+
+### Installation
+1. Press `Win` + `R`
+2. Paste this into the window that popped up: `%appdata%/.minecraft/LabyMod-neo/addons` and press enter
+3. It should open your Labymod addon directory; Paste the [Toolbreak-Warning.jar](https://github.com/RappyLabyAddons/RainbowGUI/releases/latest/download/RainbowGUI.jar) in there.
+4. Launch your Labymod client.
+
+If you have any problems with the addon/have update ideas, feel free to
+- Open an Issue [here](https://github.com/RappyLabyAddons/RainbowGUI/issues/new/choose)
+  or
+- Open a ticket on my [Discord Server](https://rappytv.com/server) in [this](https://discord.com/channels/815912035124248587/840285653946204181) channel