Add examples project

Examples/GitHub Search/GitHubSearchWithSwiftUI/Extension/Combine.swift

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+//
+//  Combine.swift
+//  GitHubSearchWithSwiftUI
+//
+//  Created by marty-suzuki on 2019/06/05.
+//  Copyright © 2019 jp.marty-suzuki. All rights reserved.
+//
+
+import Foundation
+
+struct CombineExtension<Base> {
+    let base: Base
+
+    init(_ base: Base) {
+        self.base = base
+    }
+}
+
+protocol CombineCompatible {
+    associatedtype CombineExtensionBase
+
+    static var combine: CombineExtension<CombineExtensionBase>.Type { get set }
+    var combine: CombineExtension<CombineExtensionBase> { get set }
+}
+
+extension CombineCompatible {
+
+    static var combine: CombineExtension<Self>.Type {
+        get {
+            return CombineExtension<Self>.self
+        }
+        set {}
+    }
+
+    var combine: CombineExtension<Self> {
+        get {
+            return CombineExtension<Self>(self)
+        }
+        set {}
+    }
+}

Examples/GitHub Search/GitHubSearchWithSwiftUI/Extension/JSONDecoder.Extension.swift

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+//
+//  JSONDecoder.Extension.swift
+//  GitHubSearchWithSwiftUI
+//
+//  Created by marty-suzuki on 2019/06/06.
+//  Copyright © 2019 jp.marty-suzuki. All rights reserved.
+//
+
+import Combine
+import Foundation
+
+extension JSONDecoder: TopLevelDecoder {}

Examples/GitHub Search/GitHubSearchWithSwiftUI/Extension/URLSession.Combine.swift

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+//
+//  URLSession.Combine.swift
+//  GitHubSearchWithSwiftUI
+//
+//  Created by marty-suzuki on 2019/06/05.
+//  Copyright © 2019 jp.marty-suzuki. All rights reserved.
+//
+
+import Combine
+import Foundation
+
+extension URLSession: CombineCompatible {}
+
+extension CombineExtension where Base == URLSession {
+
+    func send(request: URLRequest) -> AnyPublisher<Data, URLSessionError> {
+
+        AnyPublisher<Data, URLSessionError> { [base] subscriber in
+
+            let task = base.dataTask(with: request) { data, response, error in
+
+                guard let response = response as? HTTPURLResponse else {
+                    subscriber.receive(completion: .failure(.invalidResponse))
+                    return
+                }
+
+                guard 200..<300 ~= response.statusCode else {
+                    let e = URLSessionError.serverError(statusCode: response.statusCode,
+                                                        error: error)
+                    subscriber.receive(completion: .failure(e))
+                    return
+                }
+
+                guard let data = data else {
+                    subscriber.receive(completion: .failure(.noData))
+                    return
+                }
+
+                if let error = error {
+                    subscriber.receive(completion: .failure(.unknown(error)))
+                } else {
+                    _ = subscriber.receive(data)
+                    subscriber.receive(completion: .finished)
+                }
+            }
+
+            // TODO: cancel task when subscriber cancelled
+            task.resume()
+        }
+    }
+}
+
+enum URLSessionError: Error {
+    case invalidResponse
+    case noData
+    case serverError(statusCode: Int, error: Error?)
+    case unknown(Error)
+}