add to readme for how to use DEFINES override (#593) #172

	# workflow for running quick, simple tests in the simulator. Runs on every push
	name: Simulator Tests

	on:
	push:

	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	max-parallel: 1
	steps:
	- uses: actions/checkout@v3
	- name: Install tools
	run: \|
	sudo apt -y update
	sudo apt -y install gcc-arm-none-eabi
	- name: Initialize submodules
	run: git submodule update --init --recursive
	- name: clean
	run: make clean
	- name: make simulator
	run: make simulator
	# simple test for verifying testing infrastructure
	# run tests in sudo for rtprio to work
	- name: Simulator Test
	run: sudo bash Validation/Simulator_Tests.sh
	# add more tests here

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