feat: add text generation model

[kausthub-kannan]

Feature Description
This is one of the core features of the project. A text-generation model is required to generate stories. This can be done in two ways.

1. Text Completion:
   The user enters some amount of context into the story. The model should complete the text based on this context.
2. Image-to-text:
   A much more sophisticated yet useful model would be to bring out the context from generated Images and generate stories out of them.