Merge pull request #6 from gitter-badger/gitter-badge

Add a Gitter chat badge to README.md

README.md

+# L2J_DataPack
+[![Gitter](https://badges.gitter.im/Join Chat.svg)](https://gitter.im/L2J/L2J_DataPack?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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