Create README.md

Author: Lurking987

plugins/tmdb-backdrop/README.md

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+## **TMDB Backdrops**
+This plugin looks to see if the Group has a TMDB URL.
+Grabs backdrop from TMDB and places it as a background image. 
+### **_Required for this plugin to work_**:
+1. Your own TMDB API. 
+
+### Steps Needed:
+- Add your TMDB API into the plugin's settings