README: added section on `Contributing` #6

	name: CI

	on:
	push:
	branches: [main]
	pull_request:
	branches: [main]

	jobs:
	build:
	name: Build and test
	runs-on: ubuntu-latest
	steps:
	- name: Download system deps
	run: sudo apt-get update -y && sudo apt-get install -y libasound2-dev
	- name: Checkout
	uses: actions/checkout@v3
	- name: Install rust
	uses: actions-rs/toolchain@v1
	with:
	toolchain: stable
	override: true
	target: x86_64-unknown-linux-gnu
	- name: Format check
	run: cargo fmt --all -- --check
	- name: Clippy check
	run: cargo clippy --all --all-targets --all-features -- -D warnings
	- name: Build
	run: cargo build
	- name: Test
	run: cargo test
	verify_msrv:
	name: Verify Minimum Supported Rust Version in Cargo.toml
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Download system deps
	run: sudo apt-get update -y && sudo apt-get install -y libasound2-dev
	- name: Install or use cached `cargo-msrv`
	uses: baptiste0928/cargo-install@v2
	with:
	crate: cargo-msrv
	- name: Verify Minimum Rust Version
	run: cargo-msrv verify

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