Add workflow for flake8. Fix code style #1

	name: Main Workflow
	on:
	push:
	branches:
	- main
	jobs:
	backend_linters:
	name: Check Linters
	runs-on: ubuntu-latest
	steps:
	- name: Check out repository code
	uses: actions/checkout@v3
	- name: Set up Python
	uses: actions/setup-python@v4
	with:
	python-version: 3.9
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install flake8==6.0.0 flake8-isort==6.0.0
	- name: Test with flake8
	run: python -m flake8 hmom3/

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