Create Hello world for macOS (#1)

components/root/rootVM.swift

@@ -0,0 +1,11 @@
+import Combine
+
+final class RootVM: ObservableObject {
+    @Published var countText = ""
+
+    static private(set) weak var shared: RootVM?
+  
+    init() {
+        Self.shared = self
+    }
+}