Add GitHub action badge to README.md #4

	# Check that syntax is correct

	name: CIFSyntaxandStyleCheck

	# Controls when the action will run. Triggers the workflow on push or pull request
	# events but only for the master branch
	on:
	push:
	branches: [ master ]
	paths-ignore:
	- '.github/**'

	pull_request:
	branches: [ master ]
	paths-ignore:
	- '.github/**'
	workflow_dispatch:

	# A workflow run is made up of one or more jobs that can run sequentially or in parallel
	jobs:
	syntax:
	# The type of runner that the job will run on
	runs-on: ubuntu-latest

	# Steps represent a sequence of tasks that will be executed as part of the job
	steps:
	# Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
	- name: checkout
	uses: actions/checkout@v4

	# Check syntax of all CIF files
	- name: check_syntax
	uses: COMCIFS/cif_syntax_check_action@master
	id: cif_syntax_check
	ddlm:
	runs-on: ubuntu-latest
	needs: syntax
	steps:
	- name: checkout
	uses: actions/checkout@v4

	- name: Checkout the coreCIF dictionary
	uses: actions/checkout@v4
	with:
	repository: COMCIFS/cif_core
	path: cif-dictionaries/cif_core

	- name: Checkout the multiblock coreCIF dictionary
	uses: actions/checkout@v4
	with:
	repository: COMCIFS/MultiBlock_Dictionary
	path: cif-dictionaries/MultiBlock_Dictionary

	- name: check_ddlm
	uses: COMCIFS/dictionary_check_action@main
	id: ddlm_check

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