Update readme to include section on pandoc-extra and github actions (… #32

	name: Long Usage

	on: push

	jobs:
	convert_via_pandoc:
	runs-on: ubuntu-22.04
	steps:
	- run: echo "foo" > input.txt # create an example file
	- uses: docker://pandoc/core:2.9
	with:
	args: >- # allows you to break string into multiple lines
	--standalone
	--output=index.html
	input.txt

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