[Keymap] clean up userspace, add XD75 / Keyboardio Atreus (#13121)

Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>

users/replicaJunction/features/secrets.h

@@ -0,0 +1,30 @@
+/* Copyright 2021 Joshua T.
+ *
+ * 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
+#include QMK_KEYBOARD_H
+
+// NOTE: In some implementations of the "secrets" functionality, the
+// secrets.h file is the file that actually contains secret text.
+//
+// This is not the case in my implementation. That file is called
+// "secret_definitions.h", and it's in a local .gitignore file so it
+// does not get committed.
+//
+// The inclusion of this file is not an error, and there is no sensitive
+// text here.
+
+bool process_record_secrets(uint16_t keycode, const keyrecord_t *record);