[Keyboard] Add keymap and settings for dactyl_manuform 6x6_5 thumb (#15526)

* Add dactyl manu 6x6 with stm32 support and 5thumb cluster

* Add review changes

* Add license to new files

* Fix enums for custom keymap

* Readme update

* Fix readme to follow one from template

* Add missing licence to files

* Update keyboards/handwired/dactyl_manuform/6x6/blackpill_f411/rules.mk

* Update keyboards/handwired/dactyl_manuform/6x6/blackpill_f411/rules.mk

* Remove readme from onekey keyboard

* Make separate macro for 5thumb

keyboards/handwired/dactyl_manuform/6x6/blackpill_f411/rules.mk

@@ -0,0 +1,30 @@
+# Copyright 2021 Bartosz Nowak (@dumam)
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+# MCU name
+MCU = STM32F411
+
+# Bootloader selection
+BOOTLOADER = tinyuf2
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = yes      # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = yes       # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = yes        # Console for debug
+COMMAND_ENABLE = yes        # Commands for debug and configuration
+NKRO_ENABLE = no            # Enable N-Key Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
+AUDIO_ENABLE = no           # Audio output
+
+
+# Build Options
+#   change yes to no to disable
+#
+SPLIT_KEYBOARD = yes
+# split settings
+# https://beta.docs.qmk.fm/developing-qmk/c-development/hardware_drivers/serial_driver
+SERIAL_DRIVER = usart