Add QMK flashing notes

docs/qmk-notes.txt

@@ -0,0 +1,24 @@
+# Update apt repo
+apt update
+# Install dependencies
+apt install build-essential gcc unzip wget zip gcc-avr binutils-avr avr-libc dfu-programmer dfu-util gcc-arm-none-eabi binutils-arm-none-eabi libnewlib-arm-none-eabi git
+
+# Clone git repo
+git clone https://github.com/qmk/qmk_firmware
+cd qmk_firmware
+# Grab submodules
+git submodule update --init --recursive
+# Grab submodules (run this to update):
+make git-submodule
+
+# Build firmware
+make xd87:default_tkl_ansi
+
+# Install firmware
+# Plug in keyboard
+# Erase firmware
+dfu-programmer atmega32u4 erase --force
+# Install new firmware
+dfu-programmer atmega32u4 flash ./xd87_default_tkl_ansi.hex
+# Reset keyboard
+dfu-programmer atmega32u4 reset