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 {}
+    }
+}