Implemented the BearerAuthMiddleware middleware in the library target.

README.md

@@ -61,26 +61,11 @@ 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(),
@@ -89,6 +74,8 @@ let client = Client(
 )
 ```
 
+The `BearerAuthMiddleware` automatically injects the `Authorization` header with the Bearer token into every outgoing request.
+
 ## Supported Platforms
 
 - iOS 13.0+