Fix title hierarchy in README #21

	name: Quality check
	on:
	pull_request:
	branches:
	- main
	push:
	branches:
	- main
	jobs:
	clang_format_check:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: RafikFarhad/clang-format-github-action@v4
	with:
	sources: "esp32-different-i2c-buses-example/*.ino"
	style: file
	build_sketch:
	runs-on: ubuntu-latest
	env:
	CLI_PATH: ./cli
	steps:
	- name: checkout
	uses: actions/checkout@v4
	- name: install arduino-cli
	run: \|
	mkdir -p $CLI_PATH
	export PATH=$PATH:$CLI_PATH
	curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh \| BINDIR=$CLI_PATH sh

	- name: build arduino r4 sketch
	run: \|
	${CLI_PATH}/arduino-cli compile --profile arduino-uno-r4 ./exampleArduinoUnoR4

	- name: build ESP32 DevKit sketch
	run: \|
	${CLI_PATH}/arduino-cli compile --profile esp32-devkitC-v4 ./exampleESP32DevKitCV4

	- name: build Nucleo sketch
	run: \|
	${CLI_PATH}/arduino-cli compile --profile stm32-nucleo64 ./exampleSTM32Nucleo64

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