DZ60 w/ 2.25u left shift and arrow cluster (#6215)

* PoC weeheavy_2.25_lshift

* KB_B should read KC_B

* L1 work

* add play/pause and brightness to layer 1

* update README

keyboards/dz60/keymaps/weeheavy_2.25_lshift/README.md

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+![DZ60 ANSI with arrow cluster](https://i.imgur.com/hX6rMcm.png)
+
+# weeheavy's DZ60 layout
+
+* Default 2.25 left shift
+* arrow cluster
+
+## Layouts
+
+The base layout is ANSI QWERTY.
+
+Key sizes (ASCII keyboards below match this scale):
+
+    1u    = 4 chars  = |  |
+    1.25u = 5 chars  = |   |
+    1.5u  = 6 chars  = |    |
+    1.75u = 7 chars  = |     |
+    2u    = 8 chars  = |      |
+    2.25u = 9 chars  = |       |
+    2.75u = 11 chars = |         |
+    6.25u = 25 chars = |                       |
+
+### Layer 0: Base layout
+
+Specialities:
+
+* Arrow cluster
+* FN: access to layer 1
+
+```
+,----------------------------------------------------------.
+|Es||1 ||2 ||3 ||4 ||5 ||6 ||7 ||8 ||9 ||0 ||- ||= || Bksp |
+|----------------------------------------------------------+
+|Tab ||Q ||W ||E ||R ||T ||Y ||U ||I ||O ||P ||[ ||] || \  |
+|----------------------------------------------------------+
+|Caps ||A ||S ||D ||F ||G ||H ||J ||K ||L ||; ||' || Enter |
+|----------------------------------------------------------+
+| Shift ||Z ||X ||C ||V ||B ||N ||M ||, ||. ||/ ||  Shift  |
+|----------------------------------------------------------+
+|Ctl||Win||Alt||          Space         |FN||← ||↑ ||↓ ||→ |
+`----------------------------------------------------------'
+```
+
+### Layer 1: Utility
+
+Specialities:
+
+* F1-F12 keys when holding FN
+* Multimedia cluster on the bottom right
+* RGB config on the left hand side
+* Reset key on ESC and backslash location
+* Brightness control top right
+* Additional "B" key (a learning from my mistakes)

keyboards/dz60/keymaps/weeheavy_2.25_lshift/keymap.c

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+#include QMK_KEYBOARD_H
+
+// Make special keycodes more visible
+#define ____ KC_TRNS
+#define XXXX KC_NO
+
+// Layer definition
+#define L0 0
+#define L1 1
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+// Base layer - ANSI QWERTY
+[L0] = LAYOUT_all(
+	KC_GESC, KC_1, KC_2, KC_3, KC_4, KC_5, KC_6, KC_7, KC_8, KC_9, KC_0, KC_MINS, KC_EQL, XXXX, KC_BSPC,
+	KC_TAB, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_LBRC, KC_RBRC, KC_BSLS,
+	KC_CAPS, KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K, KC_L, KC_SCLN, KC_QUOT, KC_ENT,
+	KC_LSFT, XXXX, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_RSFT, KC_RSFT, KC_RSFT,
+	KC_LCTL, KC_LGUI, KC_LALT, KC_SPC, KC_SPC, KC_SPC, MO(L1), KC_LEFT, KC_UP, KC_DOWN, KC_RIGHT),
+
+// Utility layer - RGB and multimedia control, reset and additional "b" button
+[L1] = LAYOUT_all(
+	RESET, KC_F1, KC_F2, KC_F3, KC_F4, KC_F5, KC_F6, KC_F7, KC_F8, KC_F9, KC_F10, KC_F11, KC_F12, ____, ____,
+	KC_B, RGB_TOG, RGB_MOD, RGB_M_K, RGB_M_R, ____, ____, KC_PSCR, ____, KC_PAUS, KC_BRID, KC_BRIU, ____, RESET,
+	____, RGB_HUI, RGB_HUD, KC_DEL, ____, ____, ____, KC_INS, KC_HOME, KC_PGUP, ____, ____, ____,
+	____, ____, RGB_SAI, RGB_SAD, ____, ____, ____, ____, ____, KC_END, KC_PGDN, KC_MPLY, ____, KC_MUTE, KC_MUTE,
+	____, RGB_VAI, RGB_VAD, ____, ____, ____, ____, KC_MPRV, KC_VOLU, KC_VOLD, KC_MNXT),
+
+};
+