Added codefactor.

Author: manastalukdar

documentation/development/ci-cd.md

@@ -15,7 +15,9 @@
 | N/A                   | CodeClimate | Check for test coverage using Circle CI | [![Test Coverage](https://api.codeclimate.com/v1/badges/2e2bfc548d29f566051a/test_coverage)](https://codeclimate.com/github/computer-science-engineering/learning-computer-science/test_coverage)                                                                                                                                             |
 | N/A                   | Codacy      | Code analysis/quality check             | [![Codacy Badge](https://app.codacy.com/project/badge/Grade/b10299a64e704411ba321229fcad3e04)](https://www.codacy.com/gh/computer-science-engineering/learning-computer-science/dashboard?utm_source=github.com&utm_medium=referral&utm_content=computer-science-engineering/learning-computer-science&utm_campaign=Badge_Grade)  |
 | N/A                   | CodeBeat    | Static code analysis                    | [![codebeat badge](https://codebeat.co/badges/29ea0010-206a-433c-813d-55eba8e9edaf)](https://codebeat.co/projects/github-com-computer-science-engineering-learning-computer-science-master)                                                                                                                                                   |
+| N/A                   | CodeFactor  | Static code analysis                    | [![CodeFactor](https://www.codefactor.io/repository/github/computer-science-engineering/learning-computer-science/badge)](https://www.codefactor.io/repository/github/computer-science-engineering/learning-computer-science)                                                                                                                 |
 | N/A                   | Codecov     | Code coverage using Circle CI           | [![codecov](https://codecov.io/gh/computer-science-engineering/learning-computer-science/branch/master/graph/badge.svg?token=IN47ioiCTU)](undefined)                                                                                                                                                                                          |
 | N/A                   | Coveralls   | Code coverage using Circle CI           | [![Coverage Status](https://coveralls.io/repos/github/computer-science-engineering/learning-computer-science/badge.svg?branch=master)](https://coveralls.io/github/computer-science-engineering/learning-computer-science?branch=master) [[Known issue](https://github.com/computer-science-engineering/learning-computer-science/issues/35)] |
 
 ## Methodology
+