[Keyboard] Add Pulse 4k, a macropad by Maxr1998 (#6195)

* Add Pulse 4k, a macropad by Maxr1998

* Some config tweaks

* Remove image note

* Add license headers

* Fix media keys

* Remove Play/pause again as it doesn't work on Linux

keyboards/maxr1998/pulse4k/pulse4k.h

@@ -0,0 +1,33 @@
+/*
+Copyright (C) 2019  Maxr1998 <max.rumpf1998@gmail.com>
+
+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 "quantum.h"
+
+#define LAYOUT( \
+      k00, k01, k02, \
+      k10, k11, k12 \
+) \
+{ \
+    { k00, k01, k02 }, \
+    { k10, k11, k12 }, \
+}
+
+void encoder_one_update(bool clockwise);
+
+void encoder_two_update(bool clockwise);