Documentation update (#17)

This PR contains the work done to update the overall documentation of the package.

Reviewed-on: #17
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

README.md

@@ -13,7 +13,7 @@ To use this library, then add it as a dependency in the `Package.swift` file of
 let package = Package(
     // name, platforms, products, etc.
     dependencies: [
-        .package(url: "https://github.com/rock-n-code/discogs-service", from: "0.3.0"),
+        .package(url: "https://github.com/rock-n-code/discogs-service", from: "0.6.1"),
         // other dependencies
     ],
     targets: [

Sources/DiscogsService/Catalogs/DiscogsService.docc/Library.md

@@ -6,6 +6,33 @@ A Swift client library for the Discogs API, built on top of Swift OpenAPI.
 
 This library provides a type-safe client for interacting with the [Discogs API](https://www.discogs.com/developers), including endpoints for the database, user identity, user collections, wantlists, lists, and the marketplace. It supports multiple authentication methods and transports credentials via headers or query parameters.
 
+## Installation
+
+To use this library, then add it as a dependency in the `Package.swift` file of your project:
+
+```swift
+    let package = Package(
+        // name, platforms, products, etc.
+        dependencies: [
+            .package(url: "https://github.com/rock-n-code/discogs-service", from: "0.6.1"),
+            // other dependencies
+        ],
+        targets: [
+            .target(
+                name: "SomeTarget",
+                dependencies: [
+                    .product(name: "DiscogsService", package: "discogs-service"),
+                ]
+            )
+            // other targets
+        ]
+    )
+```
+
+It is also possible to use this library with your app in Xcode, then add it as a dependency in your Xcode project.
+
+> important: Swift 5.10 or higher is required in order to compile this library.
+
 ## Topics
 
 ### Clients