Initial commit

Added support for entity capture and spawning with eggs
Added README
Added spigot docker build tools
Added some comments

README.md

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+# Mob Capture
+
+This plugin serves as a basic example on how to use NBTEditor to manipulate entity data, such as
+storing it in an item, and retrieving and applying it to an existing entity. It also highlights
+the ability to work with entirely vanilla mechanics, such as spawn eggs, which can be extended to
+work with more complex things, like spawners.