[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/info.json

@@ -0,0 +1,20 @@
+{
+  "keyboard_name": "Pulse 4k",
+  "keyboard_folder": "maxr1998/pulse4k",
+  "url": "https://github.com/Maxr1998/Pulse_4k",
+  "maintainer": "Maxr1998",
+  "width": 3,
+  "height": 2,
+  "layouts": {
+    "LAYOUT_pulse4k": {
+      "key_count": 6,
+      "layout": [ 
+        { "w": 1, "x": 0, "y": 0 }, 
+        { "w": 1, "x": 1, "y": 0 }, 
+        { "w": 1, "x": 2, "y": 0 }, 
+        { "w": 1, "x": 0, "y": 1 }, 
+        { "w": 1, "x": 1, "y": 1 }, 
+        { "w": 1, "x": 2, "y": 1 } ]
+    }
+  }
+}