chore(readme): add contributors image (#191)

Thanks to everyone who have contributed to this repository (even you @dependabot-preview 😎)

Author: ratanparai

README.md

@@ -58,5 +58,9 @@ Everyone is welcome to contribute, whether it's in the form of code, documentati
 As mentioned, we'd appreciate your feedback, improvements and ideas.
 You can create new issues at the issues section, do pull requests and/or send emails to **techcombd@outlook.com**
 
+### Thanks to all the people and bot (😉) who have contributed
+
+[![contributors](https://contributors-img.web.app/image?repo=OpenCodeFoundation/eSchool)](https://github.com/OpenCodeFoundation/eSchool/graphs/contributors)
+
 ## License
-Code licensed under the [MIT License](https://github.com/OpenCodeFoundation/eSchool/blob/master/LICENSE).
+Code licensed under the [MIT License](https://github.com/OpenCodeFoundation/eSchool/blob/master/LICENSE).