Create README.md

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+Current implementation:
+```
+ +----------------------------------------------------------+
+ | BaseItem <-| FileItem <-- URLItem <-- URLFromPlaylistItem|
+ |          <-| RadioItem                                   |
+ +----------------------------------------------------------+
+  ^
+  |
+  v
+  +--------------------+
+  |PlayList            |
+  |PlaylistItemWrapper |
+  +--------------------+
+```
+
+Goal:
+```
++----------------------------------------------------------+
+|          <-| URLItem <-- URLFromPlaylistItem             |
+| BaseItem <-| FileItem                                    |
+|          <-| RadioItem                                   |
+++---------------------------------------------------------+
+ ^
+ |
+ v
+ +-----------+
+ |PlayList   |
+ |           |
+ +-----------+
+
+```