Add examples project

Examples/GitHub Search/GitHubSearchWithSwiftUI/View/RepositoryListViewModel.swift

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+//
+//  RepositoryListViewModel.swift
+//  GitHubSearchWithSwiftUI
+//
+//  Created by marty-suzuki on 2019/06/06.
+//  Copyright © 2019 jp.marty-suzuki. All rights reserved.
+//
+
+import Combine
+import Foundation
+import SwiftUI
+
+final class RepositoryListViewModel: BindableObject {
+
+    let didChange: AnyPublisher<RepositoryListViewModel, Never>
+    private let _didChange = PassthroughSubject<RepositoryListViewModel, Never>()
+
+    private let _searchWithQuery = PassthroughSubject<String, Never>()
+    private lazy var repositoriesAssign = Subscribers.Assign(object: self, keyPath: \.repositories)
+
+    private(set) var repositories: [Repository] = [] {
+        didSet {
+            // TODO: Do not want to use DispatchQueue.main here
+            DispatchQueue.main.async {
+                self._didChange.send(self)
+            }
+        }
+    }
+
+    deinit {
+        repositoriesAssign.cancel()
+    }
+
+    init() {
+        self.didChange = _didChange.eraseToAnyPublisher()
+
+        _searchWithQuery
+            .flatMap { query -> AnyPublisher<[Repository], Never> in
+                RepositoryAPI.search(query: query)
+                    .replaceError(with: [])
+                    .eraseToAnyPublisher()
+            }
+            .receive(subscriber: repositoriesAssign)
+    }
+
+    func search(query: String) {
+        _searchWithQuery.send(query)
+    }
+}