docs: add About section to backend README #225

	name: Backend

	on: [pull_request, push]

	env:
	# Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
	BUILD_TYPE: Release

	jobs:
	test:
	# The CMake configure and build commands are platform agnostic and should work equally
	# well on Windows or Mac. You can convert this to a matrix build if you need
	# cross-platform coverage.
	# See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2

	- name: Get Conan
	uses: turtlebrowser/[email protected]

	- name: Create default profile
	working-directory: ./backend
	run: conan profile detect

	- name: Install dependencies
	working-directory: ${{github.workspace}}/backend
	run: conan install . --output-folder=build --build=missing -s build_type=${{env.BUILD_TYPE}}

	- name: Configure CMake
	working-directory: ${{github.workspace}}/backend/build
	run: cmake .. -DCMAKE_TOOLCHAIN_FILE=conan_toolchain.cmake -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}

	- name: Build
	working-directory: ${{github.workspace}}/backend/build
	run: cmake --build . --config ${{env.BUILD_TYPE}}

	- name: Run tests
	working-directory: ${{github.workspace}}/backend/build
	run: ./tests/pdl_test

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