add Testwell CTC++ coverage support

Author: guwirth

README.md

@@ -45,6 +45,7 @@ Sensors for **static and dynamic code analysis**:
 * Gcov / gcovr coverage reports
 * Bullseye coverage reports (http://www.bullseye.com/)
 * Cobertura coverage reports (http://cobertura.github.io/cobertura/)
+* Testwell CTC++ coverage reports (https://www.verifysoft.com/en_ctcpp.html)
 
 Simple to **customize**
 * provide the ability to write custom rules