Add a few badges to README. #27

	name: Test systemd

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

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Set up Go
	uses: actions/setup-go@v4
	with:
	go-version: "1.21"

	- name: Build
	run: go build -v

	- name: Install go-mmproxy
	run: \|
	sudo cp go-mmproxy /usr/bin/go-mmproxy
	sudo mkdir /etc/go-mmproxy
	echo 192.168.0.0/16 \| sudo tee /etc/go-mmproxy/net-prefixes.txt
	sudo cp go-mmproxy.service.example /etc/systemd/system/go-mmproxy.service
	sudo systemctl daemon-reload

	- name: Start go-mmproxy
	run: sudo systemctl start go-mmproxy \|\| sudo journalctl -xeu go-mmproxy.service

	- name: Check go-mmproxy status
	run: systemctl is-active go-mmproxy

	- name: Replace listen address of go-mmproxy with a hostname
	run: \|
	sudo sed -i 's/-l 0.0.0.0:1234/-l %H:1234/' /etc/systemd/system/go-mmproxy.service
	sudo systemctl daemon-reload

	- name: Restart go-mmproxy
	run: sudo systemctl restart go-mmproxy \|\| sudo journalctl -xeu go-mmproxy.service

	- name: Check go-mmproxy status
	run: systemctl is-active go-mmproxy

Provide feedback