Add login screen test

frontend/test/e2e/index.test.js

 module.exports = {
-  'Demo test Index' : function (browser) {
-    console.log(this)
+  'Welcome screen' : function (browser) {
     browser
       .url(browser.globals.url)
       .waitForElementVisible('body')
       .assert.containsText('.jumbotron', 'Welcome to OpenAppStack')
+      .assert.containsText('.btn.btn-success', 'Login')
+      .assert.containsText('a.dropdown-item', 'Login')
+      .end();
+  },
+  'Login screen' : function (browser) {
+    browser
+      .url(browser.globals.url)
+      .waitForElementVisible('body')
+      .click("link text", "Login")
+      .assert.containsText('.btn', 'Login with OAS')
       .end();
   }
 };