[Keyboard] Grid 600 Type 05 "PRESS" Cover Module (#6368)

* add grid600 type 5 press cover module

* Update keyboards/grid600/press/keymaps/default/keymap.c

Co-Authored-By: fauxpark <fauxpark@gmail.com>

* remove unused custom keycode enum

1 files changed, 18 insertions, 0 deletions

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+# Grid 600 Type 05 "PRESS" Cover Module
+
+Cover module for Grid 600 Keyboard with 4 keys.
+
+Code for the module was originally located at [gridishere's QMK fork](https://github.com/gridishere/qmk_firmware/tree/master/keyboards/grid/gridmod5).  
+
+Please keep in mind that this is actually a separate keyboard from the one installed in the Grid 600. 
+Functionality such as layer changes and light modifications triggered on one PCB will not affect the other.  
+
+Keyboard Maintainer: [MechMerlin](https://github.com/mechmerlin)  
+Hardware Supported: Grid 600 Type 05 "PRESS" cover module.   
+Hardware Availability: [zFrontier](https://en.zfrontier.com/products/grid600s)  
+
+Make example for this keyboard (after setting up your build environment):
+
+    make grid600/press:default
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).