[mirotalksfu] - whiteboard :: add image select

public/Room.html

@@ -188,6 +188,8 @@ access to use this app.
                     <button id="whiteboardObjectBtn" class="fas fa-mouse-pointer"></button>
                     <button id="whiteboardUndoBtn" class="fas fa-undo"></button>
                     <button id="whiteboardRedoBtn" class="fas fa-redo"></button>
+                    <button id="whiteboardImgFileBtn" class="far fa-image"></button>
+                    <button id="whiteboardImgUrlBtn" class="fas fa-link"></button>
                     <button id="whiteboardTextBtn" class="fas fa-spell-check"></button>
                     <button id="whiteboardLineBtn" class="fas fa-slash"></button>
                     <button id="whiteboardRectBtn" class="far fa-square"></button>