feat(bluetooth): Add new settings_reset shield.

* Easy to build board/image that will clear
  saved profile/bond information for a fresh
  start for keyboards.

app/boards/shields/settings_reset/settings_reset.keymap

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <behaviors.dtsi>
+#include <dt-bindings/zmk/keys.h>
+
+/ {
+    keymap {
+        compatible = "zmk,keymap";
+
+        default_layer {
+            bindings = <
+    &reset
+            >;
+        };
+    };
+};
+
+