[BUG] Add description for supported statements

**Describe the feature request**
The platform supports basic python capabilities shown in the [scripts](https://github.com/NimbleEdge/deliteAI/blob/5557d77b08daf99cb4c6d2f0789238ea349140ce/nimblenet_py/simulation_assets/chatbot.py)

The description can be made better at [docs website](https://deliteai.dev/delitepy/docs/gen/docs/statements.html)