chore: Add readme and one example for now.

README.md

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+# Jellyfin SmartPlaylist Plugin
+
+Smart playlists with lisp filter engine.
+
+## How to use
+
+After [installing](#installation) the plugin and restarting Jellyfin
+create a file in `config/data/smartplaylist` like this:
+
+```
+$ echo '{}' > config/data/smartplaylist/a.json
+```
+
+Afterwards run the Task `(re)generate Smart Playlists`, this will rename
+the `json` file and populate it with some default values. You can now
+adjust the file to your liking. [Go here](/examples/index.md) to see more
+examples.
+
+Example file
+```json
+{
+  "Id": "a1d02dee-f1da-4472-bee3-f568c15c8360",
+  "Playlists": [
+    {
+      "PlaylistId": "24f12e1e-3278-d6d6-0ca4-066e93296c95",
+      "UserId": "6eec632a-ff0d-4d09-aad0-bf9e90b14bc6"
+    }
+  ],
+  "Name": "a1d02dee-f1da-4472-bee3-f568c15c8360",
+  "Program": "(begin (invoke item 'IsFavoriteOrLiked' (user)))",
+  "Filename": "/config/data/smartplaylists/a1d02dee-f1da-4472-bee3-f568c15c8360.json",
+  "Enabled": true
+}
+```
+
+### Id
+
+Arbitrary Id assigned to this playlist, can usually be left alone.
+The filename is derived from this.
+
+### Playlists
+
+A list of Playlist/User mappings. By default all users get an entry.
+
+The ids must have the dashes in them as of now. To convert a id
+from without dashes to the canonical form run this command:
+
+`echo '<your id here>' | python3 -c 'import uuid; import sys; print(uuid.UUID(sys.stdin.read().strip()))'`
+
+To get your user id navigate to your user profile and copy the part
+after `userId` in the address bar.
+
+#### PlaylistId
+
+The id of the playlist that should be managed, must be owned by the
+corresponding user.
+
+#### UserId
+
+The user associated with this playlist.
+
+### Name
+
+The name of the generated playlists, this is just a default value.
+If the user changes the name of their playlist the plugin will
+work as usual
+
+### Program
+
+A lisp program to decide on a per item basis if it should be included in
+the playlist, return `nil` to not include items, return `t` to include
+them.
+
+### Filename
+
+The path to this file.
+
+### Enabled
+
+Enable this playlist, currently ignored.
+
+
+## Installation
+
+Download the `.dll` in the releases section and place it in your `plugin` directory.

examples/a1d02dee-f1da-4472-bee3-f568c15c8360.json

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+{
+  "Id": "a1d02dee-f1da-4472-bee3-f568c15c8360",
+  "Name": "Favourite Pop",
+  "Program": "(and (invoke item 'IsFavoriteOrLiked' (user)) (find 'Pop' (car (getitems item 'Genres'))))"
+}

examples/index.md

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+# Examples
+
+* [Favourite Pop](a1d02dee-f1da-4472-bee3-f568c15c8360.json): A Playlist
+  containing all favourite items of the genre pop.