Add README.md for src/ directory. #4

	name: CI for Lint checks
	# https://github.com/google/mozc/blob/master/docs/build_mozc_in_docker.md

	# Run on push.
	on: push

	permissions: read-all

	# Prevent previous workflows from running.
	concurrency:
	group: ${{ github.workflow }}-${{ github.head_ref \|\| github.ref }}
	cancel-in-progress: true

	jobs:
	buildifier:
	# https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2404-Readme.md
	runs-on: ubuntu-24.04
	timeout-minutes: 20

	steps:
	# Checkout without submodules to exclude third_party code from lint check
	- name: Checkout
	uses: actions/checkout@v4
	with:
	submodules: 'false'

	- name: Run
	working-directory: ./src
	run: \|
	go install github.com/bazelbuild/buildtools/buildifier@latest
	$(go env GOPATH)/bin/buildifier --mode=diff -r .

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