Created AniDB Builders (markdown)

AniDB-Builders.md

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+You can build different collections using the features of [AniDB.net](https://anidb.net/) (AniDB).
+
+| Name | Attribute | Description | Works with Movies | Works with Shows |
+| :-- | :-- | :-- | :--: | :--: |
+| [AniDB ID](#anidb-id) | `anidb_id` | Gets the anime specified by the AniDB ID | :heavy_check_mark: | :heavy_check_mark: |
+| [AniDB Relation](#anidb-relation) | `anidb_relation` | Gets all anime in the relation graph of the specified AniDB ID | :heavy_check_mark: | :heavy_check_mark: |
+| [AniDB Popular](#anidb-popular) | `anidb_popular` | Gets every anime in AniDB's [Popular Anime](https://anidb.net/latest/anime/popular/?h=1) list | :heavy_check_mark: | :heavy_check_mark: |
+
+## AniDB ID
+Gets the anime specified by the AniDB ID.
+
+The expected input is an AniDB ID or AniDB Anime URL. Multiple values are supported as either a list or a comma separated string.
+
+## AniDB Relation
+Gets all anime in the relation graph of the specified AniDB ID.
+
+To see the relation graph of an anime use: `https://anidb.net/anime/<ANIDB_ID>/relation/graph` but replace `<ANIDB_ID>` with the AniDB ID you want to see the relations for.
+
+The expected input is an AniDB ID, AniDB Anime URL, or AniDB Anime Relation URL. Multiple values are supported as either a list or a comma separated string.
+
+## AniDB Popular
+Gets every anime in AniDB's [Popular Anime](https://anidb.net/latest/anime/popular/?h=1) list.
+
+The expected input is a single integer value of how much anime to query with a max of 30.
+
+The `sync_mode: sync` option is also recommended since the Trakt Trending lists are continuously updated.
+
+```yaml
+collections:
+  AniDB Popular:
+    anidb_popular: 30
+    sync_mode: sync
+```