Add readme

Author: blablubbabc

README.md

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+# ShopkeepersEI - ExecutableItems integration for Shopkeepers
+
+This is a Bukkit plugin that integrates **ExecutableItems** with the **Shopkeepers** plugin: With this plugin, shopkeepers can automatically update any ExecutableItems they contain to their latest version.
+
+## Prerequisites
+
+- This plugin might only support [Paper](https://papermc.io/) currently.
+- [Shopkeepers plugin](https://www.spigotmc.org/resources/shopkeepers.80756/)
+- [ExecutableItems plugin](https://www.spigotmc.org/resources/custom-items-plugin-executable-items.77578/)
+
+## Usage
+
+While this plugin is running, execute the [`/shopkeepers updateItems`](https://github.com/Shopkeepers/Shopkeepers-Wiki/wiki/Commands#shopkeeper-updateitems) command: This updates any ExecutableItems inside shopkeepers to their latest version.
+
+## Other Commands
+
+### `/shopkeepersei`
+
+Base command.
+
+Alias: `sei`  
+Permission: `shopkeepersEI.commands`
+
+### `/shopkeepersei reload`
+
+Reloads the plugin config.
+
+Permission: `mysthicCommandManager.admin`  
+
+## Installation
+
+1. Download the plugin Jar (TODO actually host it somewhere)
+2. Place the Jar into your server's `plugins` folder
+3. Restart your server