Add peterfalken userspace & keymaps (#19897)

Co-authored-by: Peter.Falken <luis.garcia@bitjester.com>

users/peterfalken/peterfalken.c

@@ -0,0 +1,11 @@
+// Copyright 2023 Peter.Falken (@PeterFalken)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "peterfalken.h"
+
+// Switch layer
+#ifndef CUSTOM_LAYER_STATE
+layer_state_t layer_state_set_user(layer_state_t state) {
+    return update_tri_layer_state(state, _LOWER, _RAISE, _ADJUST);
+}
+#endif  // CUSTOM_LAYER_STATE