Update documentation and description for playground

[maptuhec]

I think that if we want to deploy the playground on production we should rework the Readme documentation and the description of the project with more relevant info for the users.

[sadiqevani]

@maptuhec Can you please propose how do you think these changes will look like/should look like?

[maptuhec]

@sadiqevani In my opinion, at least compared to other tools that I have used we should have the following:

• Brief description of the project (what is the playground, what is used for etc.)
• If there are any requirements for the project
• Description of the current functionalities (editor, configs)
• Some examples and how to use the application