Smart repository: April 2021 updates

* Security releases of dependencies merged

* Minor updates related to localization of the user interface in Marathi (Devnagari)

* Test-automation started. We are now using GitHub actions. Created a workflow for Laravel with PHP7.4 and MySQL for running tests on GitHub. This will surely help maintain the quality of the software.

* Smart Repository team will now be adopting a test-driven development strategy. Only a few Feature tests have been added now. Many more tests will be added to continuously test the software as we go on adding updates and features.

* We are looking for volunteers to join the development of this exciting software.

* Glad to see that Smart Repository has started generating interest among developers. See below!