Add microphone mute (#158)

* Add code

* add code

frontend/shared/MicrophoneMuted.svelte

@@ -0,0 +1,20 @@
+<svg
+  xmlns="http://www.w3.org/2000/svg"
+  width="100%"
+  height="100%"
+  viewBox="0 0 24 24"
+  fill="none"
+  stroke="currentColor"
+  stroke-width="2"
+  stroke-linecap="round"
+  stroke-linejoin="round"
+  class="feather feather-mic"
+  ><path d="M12 1a3 3 0 0 0-3 3v8a3 3 0 0 0 6 0V4a3 3 0 0 0-3-3z" /><path
+    d="M19 10v2a7 7 0 0 1-14 0v-2"
+  /><line x1="12" y1="19" x2="12" y2="23" /><line
+    x1="8"
+    y1="23"
+    x2="16"
+    y2="23"
+  /><line x1="1" y1="1" x2="23" y2="23" /></svg
+>