Add CI badge to README.md

Author: FastAlien

README.md

@@ -1,6 +1,8 @@
 # AuthMonitor
 
+![CI status](https://github.com/FastAlien/AuthMonitor/actions/workflows/ci.yml/badge.svg)
+
 A daemon that powers off computer after nth incorrect login attempt. If you use disk encryption, which is
 strongly recommended, in most cases the password used for disk encryption is much stronger than user password, so this
 tool can be used as additional protection when notebook is lost or stolen. If you don't use disk encryption it won't
-be useful for you.
+be useful for you.