[Keyboard] Add Meck TKL handwired (#15533)

* Add meck_tkl

* Fix configuration and pin assignment

* Rellocate A10 pin, as it is used by the USB DFU bootloader

* Add volume and media keys to the function keys layer

* Rellocate source files to the handwired keyboards folder and add documentation

* Review changes for PR
- Improve LAYOUT macro to match the keyboard layout.
- Use "kxy" as pin names on the LAYOUT macro.
- Remove unused mcuconf.h and halconf.h.
- Fix README.

* Improve layout macro naming

1 files changed, 37 insertions, 0 deletions

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+# meck_tkl
+
+![meck_tkl](https://i.imgur.com/eIpQTjQ.jpeg)
+
+A standard tenkeyless keyboard, using STM32 Blackpill.
+
+* Keyboard Maintainer: [Gabriel Kim](https://github.com/gabrielkim13)
+* Hardware Supported: Blackpill F401
+* Hardware Availability: [Thingiverse: Mechanical Keyboard - MECH - TKL](https://www.thingiverse.com/thing:4225961)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/meck_tkl:default
+
+Flashing example for this keyboard:
+
+    make handwired/meck_tkl: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 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available
+
+## Wiring instructions
+
+- On Blackpill boards, **avoid** using the following pins, since they will cause either USB enumeration or the DFU bootloader to not work correctly:
+  - **USB-related pins:** `PA10`, `PA11`, `PA12`
+  - **BOOT1 pin:** `PB2`
+
+Sample wiring:
+
+![wiring](https://i.imgur.com/jIDmsNy.jpg)