Create Changelog.md

Changelog.md

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+# Changelog
+## Version 21.12
+
+### Collections:
+#### Added:
+* Autocollection for Marvel Cinematic Universe
+* Popular, Top Rated and Recommended collections
+    * Requires TheMovieDB api key for this to work.
+    * Popular is based on popular movies on TheMovieDb
+    * Top Rated is based on the top rated on TheMovieDb
+    * Recommended requires Tautulli to work
+        * Takes the most popular movie as seen on the Tautulli home page and finds the recommended movies from TheMovieDB
+* Config options added to enable/disable each collection
+
+#### Changes:
+* Changed the logic behind the colleciton creation. Collections are now Smart collections so the script doesn't need to be re-run for Films to be added. 
+    * Smart collection creation is almost instant
+    * Existing Disney/Pixar collections will be converted into Smart collections.
+    * If you have a Collection called 'Marvel Cinematic Universe' this will be converted into a smart collection
+    * Option to use a default poster for Disney, Pixar and Marvel Cinematic Universe. 
+    * Exisiting artwork for these collections will be transfered to new smart collections unless default collection artwork is enabled in the config. 
+* Collections are handled as a single script. Individual scripts can be enabled/disabled in the config page. 
+
+### Posters 4K:
+#### Added:
+* Dolby Atmos and DTS:X banners for your films.
+
+#### Changes:
+* The script now saves the temp posters to RAM rather than to disk. This should help with corrupted posters.
+* Posters are uploaded once rather than after addiong each individual banner. (4k/HDR banners are handled separately from Audio banners as audio banners are applied to all your films, not just 4k or HDR versions.)
+* Dolby vision detection has been re-worked for updates to Media Info so should work porperly now. 
+* Truncated images are logged
+* Temp posters are created with the film title to avoid uploading the incorrect posters to other films. 
+
+
+### Misc Changes:
+#### Front end
+* Moved Help page so it is on the side menu
+* Config page is now split into server config and options. New options added. 
+* Javascript for viewing the logs pages changed, as well with slight tweaks to CSS. 
+
+#### Backend
+* Reworked how the web pages are rendered
+* New config options will be added to the database
+    * All new options default to empty or false.
+* Dev page for debugging HDR detection and audio codec detection. 
+* TZ variable removed from Unraid template. Should be configured automatically.
+
+#### Misc
+* Some typos fixed.