Add detailed placeholders documentation for Giveaway and Spotify sections

Author: jesperrichert

docs/placeholders.mdx

@@ -12,6 +12,34 @@ icon: square-root-variable
 
 ---
 
+## Giveaway
+
+| Placeholder      | Description                                   | Where you can use                           |
+| ---------------- | --------------------------------------------- | ------------------------------------------- |
+| `{entrys}`       | Replace with the amount of entrys             | Title, Description, Author, Footer, Message |
+| `{winner}`       | Replace with the winner of the giveaway       | Title, Description, Author, Footer, Message |
+| `{prize}`        | Replace with the prize of the giveaway        | Title, Description, Author, Footer, Message |
+| `{duration}`     | Replace with the duration of the giveaway     | Title, Description, Author, Footer, Message |
+| `{hostedBy}`     | Replace with the host of the giveaway         | Title, Description, Author, Footer, Message |
+| `{requirements}` | Replace with the requirements of the giveaway | Title, Description, Author, Footer, Message |
+
+## Spotify
+
+| Placeholder                     | Description                                                                                   | Where you can use                                     |
+| ------------------------------- | --------------------------------------------------------------------------------------------- | ----------------------------------------------------- |
+| `{author}`                      | Replace with Shows owner                                                                      | Title, Description, Author, Footer, Message           |
+| `{title}`                       | Replace with Show Title                                                                       | Title, Description, Author, Footer, Message           |
+| `{description}`                 | Replace with Show Description                                                                 | Title, Description, Author, Footer, Message           |
+| `{spotify.episode.description}` | Replace with Episode Description                                                              | Title, Description, Author, Footer, Message           |
+| `{spotify.show.url}`            | Replace with Show URL ([Spotify](https://open.spotify.com/show/4rOoJ6K8p5y0y0jX2v1a3g))       | Title, Description, Author(URL), Footer(URL), Message |
+| `{spotify.episode.url}`         | Replace with Episode URL ([Spotify](https://open.spotify.com/episode/4rOoJ6K8p5y0y0jX2v1a3g)) | Title, Description, Author(URL), Footer(URL), Message |
+| `{spotify.author.image}`        | Replace with Author Image URL                                                                 | Message, Image, Thumbnail, Author Image, Footer Image |
+| `{spotify.episode.image}`       | Replace with Episode Image URL                                                                | Message, Image, Thumbnail, Author Image, Footer Image |
+| `{episodeid}`                   | Replace with Episode ID                                                                       | Title, Description, Author, Footer, Message           |
+| `{showid}`                      | Replace with Show ID                                                                          | Title, Description, Author, Footer, Message           |
+| `{total_episodes}`              | Replace with Total Episodes                                                                   | Title, Description, Author, Footer, Message           |
+| `{publisher}`                   | Replace with Publisher                                                                        | Title, Description, Author, Footer, Message           |
+
 ## Welcome & Leave
 
 | Placeholder            | Description                                            | Where you can use                                    |