[Keymap] Add custom corne keymap (#9283)

* Add custom corne keymap

* Clean up rules.mk

* Clean up base layer on keymap.c

* Clean up lower layer on keymap.c

* Clean up raise layer on keymap.c

* Clean up adjust layer in keymap.c

keyboards/crkbd/keymaps/gotham/keycodes.h

@@ -0,0 +1,28 @@
+#pragma once
+
+enum layers {
+    _QWERTY,
+    _LOWER,
+    _RAISE,
+    _ADJUST,
+};
+
+enum custom_keycodes { QWERTY = SAFE_RANGE, LOWER, RAISE, ADJUST, RGBRST };
+
+#define SFT_EQ MT(MOD_LSFT, KC_EQL)
+#define SFT_QT MT(MOD_RSFT, KC_QUOT)
+
+#define SFT_A MT(MOD_LSFT, KC_A)
+#define CTL_Z MT(MOD_LCTL, KC_Z)
+
+#define SFT_SCLN MT(MOD_RSFT, KC_SCLN)
+#define CTL_SLSH MT(MOD_RCTL, KC_SLSH)
+
+#define LOW_SPC LT(_LOWER, KC_SPC)
+#define RAI_EQ LT(_RAISE, KC_EQL)
+#define RAI_ENT LT(_RAISE, KC_ENT)
+#define LOW_BSP LT(_LOWER, KC_BSPC)
+#define LOW_DEL LT(_LOWER, KC_DEL)
+#define ADJ_GRV LT(_ADJUST, KC_GRV)
+#define KC_ANGL LSFT(KC_COMM)
+#define KC_ANGR LSFT(KC_DOT)