Add network status component.

- Tracks status uof user's network connection.

src/app/shared/network-status/network-status.component.html

@@ -0,0 +1,13 @@
+<nav class="navbar navbar-dark bg-dark">
+  <h1 class="navbar-brand">
+    <div *ngIf="noInternetConnection; then offlineBlock else onlineBlock"></div>
+    <ng-template #offlineBlock>
+      <strong style="color: red;">OFFLINE </strong>
+      <img width="20rem" src="assets/images/no-wifi.svg" alt="Internet Disconnected">
+    </ng-template>
+    <ng-template #onlineBlock>
+      <strong style="color: lawngreen;">ONLINE </strong>
+      <img width="20rem" src="assets/images/wifi.svg" alt="Internet Connected">
+    </ng-template>
+  </h1>
+</nav>