wrote initial readme

README.md

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-# skyblock
-SkyBlock plugin for Spigot-based Minecraft servers
+# SkyBlock
+Minimalist SkyBlock plugin for Spigot-based Minecraft servers
+
+## Installation
+1. Download [this JAR file](https://github.com/gekkedev/skyblock/releases/latest) or compile it by yourself.
+2. Place the file in your server's plugins directory (using `/reload` is not recommendable).
+
+## Usage
+Enter `/skyblock` or just `/sb` to start playing SkyBlock and `/spawn` (an additional plugin is required for this).  
+In case you ever mess up, you can reset your island by entering `/skyblock reset` or just `/sb reset` and the SkyBlock island will be recreated.
+
+## Compatibility
+The plugin is intended to run on Spigot 1.13.2 or higher.