docs: Document lavasearch integration

docs/docs/integrations/lavasearch.md

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+# LavaSearch
+
+The [LavaSearch](https://github.com/topi314/LavaSearch) lavalink plugin allows to search tracks more advanced than the default Lavalink search.
+
+## Installation
+
+For using the Lavasrc integration, you need to install the [`Lavalink4NET.Integrations.Lavasearch`](https://www.nuget.org/packages/Lavalink4NET.Integrations.Lavasearch) package.
+
+:::caution
+You need to have the [Lavasearch plugin](https://github.com/topi314/Lavasearch#lavalink-usage) installed on your Lavalink server.
+:::
+
+## Usage
+
+In order to resolve tracks using the Lavasearch integration, you can use the `SearchAsync` method on the `ITrackManager` interface.
+
+:::info
+In the following example, the track is resolved using Spotify. Lavasearch works together with search plugins like Lavasrc which need to be installed on the Lavalink server.
+:::
+
+```cs
+var searchResult = await audio.Tracks.SearchAsync(
+    query: "[...]",
+    loadOptions: new TrackLoadOptions(SearchMode: TrackSearchMode.Spotify),
+    categories: ImmutableArray.Create(SearchCategory.Track));
+
+var tracks = searchResult.Tracks;
+var playlists = searchResult.Playlists;
+var albums = searchResult.Albums;
+var artists = searchResult.Artists;
+var texts = searchResult.Texts;
+```
+
+You can specify the search mode using the `TrackLoadOptions` parameter. The categories Lavasearch should search for can be specified using the `categories` parameter.
+
+Depending on what categories you specified, the `SearchResult` object will contain tracks, playlists, albums, artists and/or texts.