Merge pull request #136 from dodona-edu/update_test_repo

Add badges

README.md

@@ -16,6 +16,11 @@
 > * https://github.com/dodona-edu/example-exercises
 >
 
+[![GitHub branch](https://img.shields.io/github/checks-status/dodona-edu/judge-sql/main)](https://github.com/dodona-edu/judge-sql/actions?query=branch%3Amain)
+[![codecov](https://codecov.io/gh/dodona-edu/judge-sql/branch/main/graph/badge.svg?token=yqUL5ee6tA)](https://codecov.io/gh/dodona-edu/judge-sql)
+[![Language grade: Python](https://img.shields.io/lgtm/grade/python/g/dodona-edu/judge-sql.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/dodona-edu/judge-sql/context:python)
+[![Python 3.10](https://img.shields.io/badge/python-3.10-green.svg)](https://www.python.org/downloads/release/python-3100/)
+
 ## Judge features
 
 - Comparison based on solution query