Implemented the BearerAuthMiddleware middleware in the library target.

Sources/ASConnectService/Catalogs/ASConnectService.docc/Library.md

@@ -59,26 +59,11 @@ The App Store Connect API requires authentication using API keys. You'll need to
 
 1. Create an API key in App Store Connect
 2. Generate a signed JWT token using your key ID, issuer ID, and private key
-3. Inject the token into each request via an OpenAPI middleware
+3. Pass the token to the built-in ``BearerAuthMiddleware`` when creating the client
 
 ```swift
-import OpenAPIRuntime
-
-struct BearerAuthMiddleware: ClientMiddleware {
-    let token: String
-
-    func intercept(
-        _ request: HTTPRequest,
-        body: HTTPBody?,
-        baseURL: URL,
-        operationID: String,
-        next: @Sendable (HTTPRequest, HTTPBody?, URL) async throws -> (HTTPResponse, HTTPBody?)
-    ) async throws -> (HTTPResponse, HTTPBody?) {
-        var request = request
-        request.headerFields[.authorization] = "Bearer \(token)"
-        return try await next(request, body, baseURL)
-    }
-}
+import ASConnectService
+import OpenAPIURLSession
 
 let client = Client(
     serverURL: try Servers.server1(),
@@ -87,6 +72,8 @@ let client = Client(
 )
 ```
 
+The ``BearerAuthMiddleware`` automatically injects the `Authorization` header with the Bearer token into every outgoing request.
+
 ## Supported Platforms
 
 - iOS 13.0+
@@ -108,6 +95,10 @@ let client = Client(
 
 - ``Client``: The main API client for making requests
 
+### Authentication
+
+- ``BearerAuthMiddleware``: A client middleware that injects a Bearer token into outgoing HTTP requests
+
 ### API Endpoints
 
 The package provides access to all App Store Connect API endpoints including: