Written the Client document extension for the DocC documentation catalog in the library target.

Sources/DiscogsService/Catalogs/DiscogsService.docc/Extensions/Client.md

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+# ``Client``
+
+## Topics
+
+### Initializers
+
+- ``Client/init(serverURL:configuration:transport:middlewares:)``
+
+### Service endpoints
+
+- ``Client/getService(_:)``
+
+### Database endpoints
+
+- ``Client/searchDatabase(_:)``
+- ``Client/getArtist(_:)``
+- ``Client/getArtistReleases(_:)``
+- ``Client/getLabel(_:)``
+- ``Client/getLabelReleases(_:)``
+- ``Client/getMaster(_:)``
+- ``Client/getMasterVersions(_:)``
+- ``Client/getRelease(_:)``
+- ``Client/getReleaseRating(_:)``
+- ``Client/getReleaseRatingByUser(_:)``
+- ``Client/putReleaseRatingByUser(_:)``
+- ``Client/deleteReleaseRatingByUser(_:)``
+- ``Client/getReleaseStats(_:)``