Add test target

Author: SuperSandro2000

Makefile

@@ -9,3 +9,9 @@ mgitstatus.1: mgitstatus.1.md
 
 .PHONY: man
 man: mgitstatus.1
+
+.PHONY: test
+test:
+		# SC1117 Backslash is literal in...
+		# SC2059 Don't use variables in the printf format string. But we need to or colors won't work
+		shellcheck -e SC1117,SC2059 mgitstatus