Add examples project

Examples/Combine using GitHub API/SwiftUI-Combine-Example/FoundationExtensions.swift

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+import SwiftUI
+import Combine
+
+enum RequestError: Error {
+    case request(code: Int, error: Error?)
+    case unknown
+}
+
+extension URLSession {
+    func send(request: URLRequest) -> AnyPublisher<(data: Data, response: HTTPURLResponse), RequestError> {
+        AnyPublisher<(data: Data, response: HTTPURLResponse), RequestError> { subscriber in
+            let task = self.dataTask(with: request) { data, response, error in
+                DispatchQueue.main.async {
+                    let httpReponse = response as? HTTPURLResponse
+                    if let data = data, let httpReponse = httpReponse, 200..<300 ~= httpReponse.statusCode {
+                        _ = subscriber.receive((data, httpReponse))
+                        subscriber.receive(completion: .finished)
+                    }
+                    else if let httpReponse = httpReponse {
+                        subscriber.receive(completion: .failure(.request(code: httpReponse.statusCode, error: error)))
+                    }
+                    else {
+                        subscriber.receive(completion: .failure(.unknown))
+                    }
+                }
+            }
+
+            subscriber.receive(subscription: AnySubscription(task.cancel))
+            task.resume()
+        }
+    }
+}
+
+extension JSONDecoder: TopLevelDecoder {}