move four_banger to bpiphany (#16082)

keyboards/bpiphany/four_banger/keymaps/default/keymap.c

@@ -0,0 +1,24 @@
+#include QMK_KEYBOARD_H
+
+enum custom_keycodes {
+  UP_URL = SAFE_RANGE
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  LAYOUT_ortho_2x2(
+    KC_1, KC_U,
+    KC_P, UP_URL
+  ),
+};
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  switch (keycode) {
+    case UP_URL:
+      if (record->event.pressed) {
+        SEND_STRING("http://1upkeyboards.com");
+      }
+      return false;
+      break;
+  }
+  return true;
+}