added shellCheck for bash formatting #5

	name: Proper Formatting on YAML files

	on: [push, pull_request]

	jobs:
	format_YAML_files:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3

	- name: Install yamllint
	run: pip install yamllint

	- name: YAML Formatting Guidelines
	run: \|
	echo "### YAML Formatting Guidelines ###
	If there is a formatting error in your YAML file, you will see errors like the one below:
	'Error: 6:4 [indentation] wrong indentation: expected 2 but found 3'

	To fix these errors, refer to the YAML formatting rules at:
	https://yamllint.readthedocs.io/en/stable/rules.html#

	Search for the keyword inside the brackets [] in the error message. In this example, it's 'indentation'.

	Note: Some rules have been customized in the '.yamllint.yaml' file. Below is the content of that file:

	extends: default

	rules:
	document-start:
	present: false
	document-end:
	present: false
	indentation:
	indent-sequences: false
	line-length:
	max: 400
	"

	- name: Lint YAML files
	run: yamllint .

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