feat: build and flash Keyboard Firmware using Makefile and QMK Submodule

.gitmodules

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+[submodule "geeboard_firmware/qmk_firmware"]
+	path = external/qmk_firmware
+	url = https://github.com/qmk/qmk_firmware.git

external/qmk_firmware

@@ -0,0 +1 @@
+Subproject commit ba63bac661c3c6154f3b42a85167b3552d29f0f8

geeboard_firmware/Makefile

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+# Inspired by Makefile from https://github.com/Felerius/planck-layout
+
+keyboard := geeboard
+layout := default
+qmk_dir := ../external/qmk_firmware
+keyboard_dir := ${qmk_dir}/keyboards/${keyboard}
+
+.PHONY: build
+build: ${keyboard_dir}
+	$(MAKE) -C ${qmk_dir} ${keyboard}:${layout}
+
+.PHONY: flash
+flash: ${keyboard_dir}
+	$(MAKE) -C ${qmk_dir} ${keyboard}:${layout}:flash
+
+.PHONY: clean
+clean:
+	$(MAKE) -C ${qmk_dir} clean
+	rm ${keyboard_dir}
+
+${keyboard_dir}:
+	ln -sf "../../../geeboard_firmware" $@
+