Updated README

Author: julian-siebert

README.md

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+
+# Octopus Paper plugin
+
+**Paper plugin with API for wrapper around Octopus SDK for o7studios product Octopus**
+
+- Runs on [Paper](https://papermc.io/software/paper)
+
+## Development
+
+Full development setup available as [Development Container](https://containers.dev/).
+Please use it for being able to tell "It works on my machine".
+
+**Docker is required to be installed on your machine!**
+
+### IntelliJ IDEA
+
+- Open IntelliJ (Welcome screen)
+- Navigate to `Remote Development` - `Dev Containers`
+- Press `New Dev Container`
+- Select `From VCS Project`
+- Select and connect with `Docker`
+- Select `IntelliJ IDEA`
+- Enter `Git Repository`: `https://github.com/o7studios/cheetah`
+- Select `Detection for devcontainer.json file` `Automatic`
+- Press `Build Container and Continue`
+
+### Development Container Issues
+
+If you encounter an issue with setting up a development container, please
+try to rebuild it first before opening a GitHub Issue. It's not uncommon
+that some issues may fix themselves after a fresh container rebuild.