Add examples project

Examples/GitHub Search/GitHubSearchWithSwiftUI/Model/RepositoryAPI.swift

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+//
+//  RepositoryModel.swift
+//  GitHubSearchWithSwiftUI
+//
+//  Created by marty-suzuki on 2019/06/06.
+//  Copyright © 2019 jp.marty-suzuki. All rights reserved.
+//
+
+import Combine
+import Foundation
+
+enum RepositoryAPI {
+
+    static func search(query: String) -> AnyPublisher<[Repository], Error> {
+
+        guard var components = URLComponents(string: "https://api.github.com/search/repositories") else {
+            return Publishers.Empty<[Repository], Error>().eraseToAnyPublisher()
+        }
+        components.queryItems = [URLQueryItem(name: "q", value: query)]
+
+        guard let url = components.url else {
+            return Publishers.Empty<[Repository], Error>().eraseToAnyPublisher()
+        }
+
+        var request = URLRequest(url: url)
+        request.addValue("application/json", forHTTPHeaderField: "Content-Type")
+        let decoder = JSONDecoder()
+        decoder.keyDecodingStrategy = .convertFromSnakeCase
+        return URLSession.shared.combine.send(request: request)
+            .decode(type: ItemResponse<Repository>.self, decoder: decoder)
+            .map { $0.items }
+            .handleEvents(receiveOutput: { print($0) },
+                          receiveCompletion: { print($0)})
+            .eraseToAnyPublisher()
+    }
+}