Replaced login screen with loader, wile validating access token

frontend/src/containers/LoaderContainer.jsx

@@ -0,0 +1,27 @@
+import React, { Component } from 'react';
+import { connect } from 'react-redux';
+import './loaderContainer.css';
+import { validateAccessToken } from '../actions/login/authActions';
+import {
+    Col
+} from 'reactstrap';
+
+class LoaderContainer extends Component {
+
+    componentDidMount() {
+        if (localStorage.accessToken) {
+            this.props.dispatch(validateAccessToken());
+        }
+    }
+
+    render() {
+        return (
+            <Col xl="12" className="loader">
+                <i className="fa fa-spinner fa-spin fa-8x login-loader" aria-hidden="true"></i>
+            </Col>
+        )
+    }
+
+}
+
+export default connect()(LoaderContainer);