Kinka it is open-source project and we are open and grateful for any contributions.
At first you can start work on the issues with label 'good first issue'
Before to start working you should install all dependencies
$ npm i
Next one you can launch yarn test-server command in package.json and open http://localhost:7077
Then you can pick some issue or create new feature request and start working on it.
Before to create PR you should cover your code in unit tests (if it possible) and call yarn unit-test command.
That command should be done is successfully.
And also, thanks for making your contribution!