Add (not yet functional) bluetooth indicator

package.json

@@ -571,6 +571,17 @@
                     ],
                     "type": "bitmap"
                 },
+                {
+                    "file": "images/bt.png",
+                    "memoryFormat": "Smallest",
+                    "name": "BT",
+                    "spaceOptimization": "storage",
+                    "targetPlatforms": [
+                        "emery",
+                        "gabbro"
+                    ],
+                    "type": "bitmap"
+                },
                 {
                     "characterRegex": "[:0-9]",
                     "file": "fonts/RetroComputerTime.ttf",