[Keyboard] Added a simple 2x5 Keypad with 4 layers (#6699)

* Added new 2x5 Keypad with 3 LEDs to indicate the selected layer.  By Jonathan Cameron.

* Minor refactor from suggestions from qmk team

* Added

* Moved to 'handwired' directory

* Update readme.md

* Update readme.md

* Update readme.md

* Update keyboards/handwired/2x5keypad/readme.md

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

* Switch to image offsite

* Moved image offsite

* Update keyboards/handwired/2x5keypad/keymaps/default/keymap.h

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

* Update keyboards/handwired/2x5keypad/2x5keypad.h

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

* Moved functions into .c file per suggestions

* Cosmetic

* Fixed function called, per suggestions.

* Update keyboards/handwired/2x5keypad/2x5keypad.h

Ok

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

* Moved LED functions to the top level since they can be used it various flavors

* Declare those moved LED functions!

* Update keyboards/handwired/2x5keypad/config.h

Co-Authored-By: Drashna Jaelre <drashna@live.com>

keyboards/handwired/2x5keypad/readme.md

@@ -0,0 +1,26 @@
+# 2x5keypad
+
+![2x5keypad](http://jmcameron.net/2x5keypad-small.jpg)
+
+This Keypad has 2 rows x 5 columns of keys. It has the top/default layer that
+has a few handy navigation keys as well as one dedicated key to cycle through
+the layers. The second layer has some media keys. The third and fourth layers
+are currently undefined (although I may use them for inserting accented French
+characters). The keypad also includes three LEDs that show which layer is
+active (no lit LEDs means the default layer).
+
+Keyboard Maintainer: [Jonathan Cameron](https://github.com/jmcameron)  
+
+Hardware:
+  * Key switch holes cut in blank piece of copper-clad project board
+  * Uses Kailh Box White switches with relegendable keycaps
+  * Chassis is three layers of wood
+  * Handwired
+  * Uses a Pro Micro
+  * Includes a reset switch accessible by a hole on the bottom
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/2x5keyapd: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).