Create Hello world for macOS (#1)

components/root/root.swift

@@ -0,0 +1,14 @@
+class RootComponent {
+    let ctrl = DialectController(RootContext())
+    static private(set) weak var singleton: RootComponent?
+
+    init() {
+        Self.singleton = self
+        rootRegisterEffects(ctrl)
+        rootRegisterShoulds(ctrl)
+    }
+
+    func setup() {
+        rootSet(F.didSetup, true)
+    }
+}