add restentpoint for login/logout, restructuring of modules and components, add flow usage

scm-ui/src/containers/App.js

@@ -0,0 +1,35 @@
+import React, { Component } from "react";
+import Navigation from "./Navigation";
+import Main from "./Main";
+import Login from "./Login";
+import { withRouter } from "react-router-dom";
+
+type Props = {
+  login: boolean
+}
+
+class App extends Component {
+
+  render() {
+
+    const { login} = this.props;
+
+    if(login) {
+      return (
+        <div>
+          <Login/>
+        </div>
+      );
+    }
+    else {
+      return (
+      <div className="App">
+        <Navigation />
+        <Main />
+      </div>
+    );
+  }
+  }
+}
+
+export default withRouter(App);