Add VIA keymap for Plaid-Pad (#10057)

* Add via keymap for Plaid-Pad

- Add VIA support for the Plaid-Pad
- Changes Vendor ID and Product ID (to follow VIA's guidelines)

* Add extra encoder pads for rev1.1

* Change Product Id from pp to PP (hex value)

* improved readme

- detailed informations about rotary encoder, bootloader and firmware

* Improved encoder informations in via keymap

* Improved encoder infos and code in default keymap

* add revision folder for rev1 and rev1.1

* change encoder assignment for defaul a via keymap

* Update keyboards/keycapsss/plaid_pad/config.h

* change revision number

* Update keyboards/keycapsss/plaid_pad/rules.mk

* Update keyboards/keycapsss/plaid_pad/rules.mk

* Update keyboards/keycapsss/plaid_pad/rules.mk

* Update keyboards/keycapsss/plaid_pad/rules.mk

* Update keyboards/keycapsss/plaid_pad/readme.md

* add license to header of *.h and *.c files

* remove the list of alternate bootloaders

- due to the pr checklist

* Update keyboards/keycapsss/plaid_pad/rules.mk

keyboards/keycapsss/plaid_pad/readme.md

@@ -2,24 +2,66 @@
 <img src="https://i.imgur.com/Jovhxpr.jpg" width="400">
 <img src="https://i.imgur.com/V82cMqq.png" width="400">
 
-A 4x4 numpad with only through hole components.  
-It's a great companion to the Plaid keyboard by [hsgw](https://github.com/hsgw/) and heavily inspired by it.
+A 4x4 numpad/macro pad with only through hole components. It supports up to 4 rotary encoder. The positions for the encoder are interchangeable with keyboard switches.  
 
+Below you can see the possible positions for the 4 rotary encoder (Rev1 only 2).  
+*If you place a encoder in the top left corner (E1), you can't use another encoder in the lower right corner.*
+```
+Rev1.1                      Rev1
+,-----------------------,   ,-----------------------,
+|  E1 |  E2 |  E3 |  E4 |   |  E1 |     |     |  E2 |
+|-----+-----+-----+-----|   |-----+-----+-----+-----|
+|     |     |     |  E3 |   |     |     |     |     |
+|-----+-----+-----+-----|   |-----+-----+-----+-----|
+|     |     |     |  E2 |   |     |     |     |     |
+|-----+-----+-----+-----|   |-----+-----+-----+-----|
+|     |     |     |  E1 |   |     |     |     |     |
+`-----------------------'   `-----------------------'
+```  
+
+- Encoder E1 performs a tap on `KC_F17` and `KC_F18`.
+- Encoder E2 performs a tap on `KC_F19` and `KC_F20`.
+- Encoder E3 performs a tap on `KC_F21` and `KC_F22`.
+- Encoder E4 performs a tap on `KC_F23` and `KC_F24`.
+
+*The F17-F24 keys are intended to be customized via [Karabiner-Elements (OSX)](https://github.com/pqrs-org/Karabiner-Elements), or [AutoHotkey](https://github.com/Lexikos/AutoHotkey_L) (WIN)*
+
+It's a great companion to the Plaid keyboard by [hsgw](https://github.com/hsgw/) and heavily inspired by it.
 * Keyboard Maintainer: BenRoe [GitHub](https://github.com/BenRoe) / [Twitter](https://twitter.com/keycapsss)
 * Hardware Supported: ATmega328P with VUSB ([see Bootloader section](#Bootloader))
 * Hardware Availability: [Keycapsss.com](https://keycapsss.com)
 
-Make example for this keyboard (after setting up your build environment):
+## QMK Firmware
+_Bootloader and Firmware ([default keymap](https://github.com/qmk/qmk_firmware/tree/master/keyboards/keycapsss/plaid_pad)) are already on the ATmega328P chip._
+
+Make example for this keyboard (after [setting up your build environment](https://docs.qmk.fm/#/getting_started_build_tools)):
 
     make keycapsss/plaid_pad:default
+    // or
+    qmk compile -kb keycapsss/plaid_pad -km default
 
 Flashing example for this keyboard:
 
     make keycapsss/plaid_pad:default:flash
-
-## Bootloader
-- same usbasploader as Plaid ([Instruction](https://github.com/hsgw/plaid/blob/master/doc/en/bootloader.md), [Repository](https://github.com/hsgw/USBaspLoader/tree/plaid))
-
----
+    // or
+    qmk flash -kb keycapsss/plaid_pad -km 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).
+
+## Bootloader
+- same `usbasploader` as used for Plaid ([Instructions](https://github.com/hsgw/plaid/blob/master/doc/en/bootloader.md), [Repository](https://github.com/hsgw/USBaspLoader/tree/plaid))
+
+### Enter bootloader mode (to flash a new firmware)
+- Plug in the USB cable
+- Push and hold RESET switch
+- Push and hold BOOT switch
+- Release RESET switch
+- Release BOOT switch
+
+or an alternative method:
+- Unplug the USB cable
+- Hold down the BOOT switch
+- Plug in the USB cable
+- Release the BOOT switch
+
+If you succeed to enter bootloader mode, you can see usbasp in device manager, or `*** USBAsp device connected` in [QMK Toolbox](https://github.com/qmk/qmk_toolbox).