welcome message on login

src/app/accounts/login.component.html

@@ -2,6 +2,8 @@
     <form #form (ngSubmit)="submit()" [appApiAction]="formPromise">
         <div class="row justify-content-center">
             <div class="col-md-8 col-lg-6">
+                <p class="text-center font-weight-bold">{{'welcome' | i18n}}</p>
+                <p class="text-center">{{'logInDesc' | i18n}}</p>
                 <div class="card">
                     <h5 class="card-header">{{'logIn' | i18n}}</h5>
                     <div class="card-body">

src/locales/en/messages.json

@@ -528,5 +528,11 @@
     },
     "intervalMin": {
         "message": "Minimum sync interval is 5 minutes."
+    },
+    "welcome": {
+        "message": "Welcome to the Bitwarden Directory Connector"
+    },
+    "logInDesc": {
+        "message": "Log in as an organization admin user below."
     }
 }