add plugin mangatx

Author: Robzimpulse

plugins/mangatx/README.md

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+# Manganelo Plugin
+
+This is the Mango plugin for [MangaTX](https://mangatx.com/). 
+
+Note that
+
+- All downloaded chapters will be placed in their respective series folder in your library.
+- Cloudflare rate limits extensive downloads. Adjust `wait_seconds` in `info.json` if you plan to download many chapters in one go (or chapters with many pages).
+
+Maintained by [@robzimpulse](https://github.com/robzimpulse).