[Keymap] add "ridingqwerty" user and keymap for atreus keyboard (#6533)

* add userspace and atreus keymap

* cleaning up notes/comments

* Update keyboards/atreus/keymaps/ridingqwerty/atreus.c

Co-Authored-By: Joel Challis <git@zvecr.com>

* Update keyboards/atreus/keymaps/ridingqwerty/atreus.c

Co-Authored-By: Joel Challis <git@zvecr.com>

* Create readme.md

* remove reference to matrix_init_kb from atreus.c

* correct atreus.c

* remove unnecessary defines

* merge register/unregister sequence into single tapcode

* move 'LAYOUT to keymap.c; remove atreus.h

* remove TAPPING_TERM from keyboard-level config.h

1 files changed, 33 insertions, 0 deletions

diff --git a/users/ridingqwerty/process_records.c b/users/ridingqwerty/process_records.c
new file mode 100644
index 0000000000..be72883ecb
--- /dev/null
+++ b/users/ridingqwerty/process_records.c
@@ -0,0 +1,33 @@
+#include "ridingqwerty.h"
+
+__attribute__ ((weak))
+bool process_record_keymap(uint16_t keycode, keyrecord_t *record) {
+  return true;
+}
+
+__attribute__ ((weak))
+bool process_record_secrets(uint16_t keycode, keyrecord_t *record) {
+  return true;
+}
+
+uint16_t user_key_timer;
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  switch(keycode) {
+    case RG_QUOT:
+      if (record->event.pressed) {
+        user_key_timer = timer_read();
+        layer_on(_NUMBER);
+        register_mods(MOD_BIT(KC_RGUI));
+      } else {
+        unregister_mods(MOD_BIT(KC_RGUI));
+        layer_off(_NUMBER);
+	if (timer_elapsed(user_key_timer) < TAPPING_TERM) {
+          register_code(KC_QUOT);
+	  unregister_code(KC_QUOT);
+	}
+      }
+      return false; break;
+  }
+  return process_record_keymap(keycode, record) &&
+    process_record_secrets(keycode, record);
+}