Add a CONTRIBUTING.md #221

	name: Build and Test
	on: [push, pull_request]

	jobs:
	build:
	name: Build
	runs-on: ubuntu-latest
	steps:
	- name: Set up Go 1.x
	uses: actions/setup-go@v4
	with:
	go-version: ^1.19

	- name: Check out code into the Go module directory
	uses: actions/checkout@v3

	- name: Build
	run: go build -v ./...

	- name: Test
	run: go test -v ./... -cover

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