MediaCMS backend, initial commit

docs/User_Scenarios.md

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+## User scenarios to test
+
+
+## test video media + image
+    try uploading a video + image, make sure they get encoded well and check they appear on index/search/category/author page
+    try editing/setting metadata, confirm action is performed, also that are searchable
+    try adding custom poster, confirm it loads well on video page/listings
+    try specifying different thumbnail time, confirm an automatic screenshot is taken
+
+
+## portal workflow
+    change workflow to unlisted, check they don't appear on index/search/category/author page
+
+## users management
+   create an admin, a MediaCMS editor and MediaCMS manager. All should see edit/delete on a media and also comments, and action should work.
+   For users edit and delete, only MediaCMS manager and admin should see edit/delete and these actions should work.
+
+## test subtitle
+    add language and test subtitling
+