add signalr support

wwwroot/css/site.css

@@ -28,7 +28,7 @@ textarea {
     resize: none;
     color: #444;
     font-size: 12px;
-    font-family: Consolas;
+    font-family: Consolas, 'Courier New';
     outline: none;
     position: absolute;
     box-sizing: border-box;
@@ -40,18 +40,25 @@ textarea {
         color: #ddd;
     }
 
-#saved-indicator {
+.toast {
     position: fixed;
     bottom: -40px;
     right: 20px;
     font-size: 12px;
-    background-color: green;
     padding: 10px;
     border-radius: 10px 10px 0 0;
     color: #fff;
     transition: bottom 0.2s;
 }
 
-    #saved-indicator.show {
+    .toast.show {
         bottom: 0;
     }
+
+#saved-indicator {
+    background-color: green;
+}
+
+#update-indicator {
+    background-color: orangered;
+}