Add CI badge

Author: fwcd

README.md

@@ -1,5 +1,7 @@
 # Pyghthouse 
 
+[![Build](https://github.com/ProjectLighthouseCAU/pyghthouse/actions/workflows/build.yml/badge.svg)](https://github.com/ProjectLighthouseCAU/pyghthouse/actions/workflows/build.yml)
+
 A Python Lighthouse Adapter
 
 (README WIP; please consult pyghthouse/ph.py for usage information.)
@@ -10,4 +12,4 @@ Example scripts can be found [here](examples)
 
 If you are experiencing errors regarding SSL certificates,
 instantiate Pyghthouse using the `ignore_ssl_cert=True`
-keyword argument.
+keyword argument.