Addition of a keypad (#14896)

* Add files via upload

* Update readme.md

* Update readme.md

* Add files via upload

* Add files via upload

* Update keymap.c

* Update config.h

* Delete config.h

* Update readme.md

* Update readme.md

* Delete readme.md

* Delete info.json.bak

keyboards/deltapad/readme.md

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+# deltapad
+
+
+
+*A short description of the keyboard/project*
+
+A 4x4 keypad 
+
+* Keyboard Maintainer: [Richard Snijder](https://github.com/rich239)
+* Hardware Supported: Atmel 32u4 based keypads
+
+
+Make example for this keyboard (after setting up your build environment):
+
+    make deltapad:default
+
+Flashing example for this keyboard:
+
+    make deltapad:default:flash
+
+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).
+
+## Bootloader
+
+Enter the bootloader in the following way:
+
+* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead
+