Add build badge for freebsd [skip ci]
| linux | [![CircleCI](https://circleci.com/gh/Bios-Marcel/cordless.svg?style=svg)](https://circleci.com/gh/Bios-Marcel/cordless) |
| darwin | [![Build Status](https://travis-ci.org/Bios-Marcel/cordless.svg?branch=master)](https://travis-ci.org/Bios-Marcel/cordless) |
| windows | [![Build status](https://ci.appveyor.com/api/projects/status/svv866htsr33hdoh/branch/master?svg=true)](https://ci.appveyor.com/project/Bios-Marcel/cordless/branch/master) |
+| freebsd | [![builds.sr.ht status](https://builds.sr.ht/~biosmarcel/cordless/freebsd.yml.svg)](https://builds.sr.ht/~biosmarcel/cordless/freebsd.yml?) |
## Overview
