[Keyboard] Rename ymdk_np21 to np21, move to ymdk vendor folder (#15641)

keyboards/ymdk/np21/keymaps/default/keymap.c

@@ -0,0 +1,26 @@
+#include QMK_KEYBOARD_H
+
+enum layer_names {
+    _NP,
+    _BL
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [_NP] = LAYOUT_ortho_6x4(
+        KC_ESC,  KC_TAB,  KC_BSPC, MO(_BL),
+        KC_NLCK, KC_PSLS, KC_PAST, KC_PMNS,
+        KC_P7,   KC_P8,   KC_P9,   KC_PPLS,
+        KC_P4,   KC_P5,   KC_P6,   KC_PPLS,
+        KC_P1,   KC_P2,   KC_P3,   KC_PENT,
+        KC_P0,   KC_DOT,  KC_PDOT, KC_PENT
+    ),
+
+    [_BL] = LAYOUT_ortho_6x4(
+        _______, _______, _______, _______,
+        _______, _______, _______, _______,
+        _______, BL_ON,   _______, BL_INC,
+        _______, BL_TOGG, _______, BL_INC,
+        _______, BL_OFF,  _______, BL_DEC,
+        BL_BRTG, _______, _______, BL_DEC
+    )
+};