Add README.

README.md

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+<div align="center">
+
+<img src="https://i.imgur.com/8qvAgA0.png" alt="ConcreteMixer Icon" width="250px">
+
+# ConcreteMixer
+
+[![](https://img.shields.io/badge/License-MPL--2.0-blue)](./LICENSE "Project License: MPL-2.0")
+[![](https://img.shields.io/badge/Java-17-orange)](# "Java Version: 17")
+[![](https://img.shields.io/github/v/release/LeafCommunity/ConcreteMixer.svg?label=Release&color=ok)](https://github.com/LeafCommunity/ConcreteMixer/releases/latest "Latest Release")
+[![](https://img.shields.io/spiget/downloads/+?color=yellow&label=Spigot%20Downloads)](https://www.spigotmc.org/resources/+/ "Spigot Resource Page")
+
+</div>
+
+Use cauldrons to make concrete. Throw in powder... get concrete!
+
+![](https://i.imgur.com/iGBYwER.gif "Concrete transformation demo.")
+
+[![](https://bstats.org/signatures/bukkit/ConcreteMixer.svg)](https://bstats.org/plugin/bukkit/ConcreteMixer/15590)