add Readme

Author: mrTomatolegit

README.md

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+# Bounceable
+
+This is a minecraft spigot plugin that makes throwable entities bounce!
+This includes snowballs, eggs, potions, arrows and many more!
+
+# Installation
+
+Drag the file into your Spigot Server's `plugins` folder
+
+# Config
+
+The [config file](src\main\resources\config.yml) explains the different settings you can change to customize the plugin
+
+<br>
+
+---
+##### Made by [mrTomatolegit](https://github.com/mrTomatolegit)