Add vnmm keymaps and userspace (#20446)

Co-authored-by: Pablo Martínez <58857054+elpekenin@users.noreply.github.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>

users/vnmm/keymap_user.h

@@ -0,0 +1,41 @@
+/* Copyright 2021
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#ifdef DYNAMIC_KEYMAP_LAYER_COUNT
+#undef DYNAMIC_KEYMAP_LAYER_COUNT
+#endif
+#define DYNAMIC_KEYMAP_LAYER_COUNT 5
+
+#define WIN_F MO(WIN_FN)
+#define MAC_F MO(MAC_FN)
+#define EXT_F MO(EXTRA_FN)
+
+#define DF_WIN DF(WIN_BASE)
+#define DF_MAC DF(MAC_BASE)
+
+// clang-format off
+
+enum layers {
+    WIN_BASE,
+    MAC_BASE,
+    WIN_FN,
+    MAC_FN,
+    EXTRA_FN
+};
+
+// clang-format on