Offline LLM support

1. Feature: Added support for running LLMs locally on your system.
   • Download mistral-7b-openorca.gguf2.Q4_0.gguf from the GPT4All website.
   • Place model inside models/https://gpt4all.io/index.html.
   • Now see the magic🌠

Added support for docx and pptx file formats.

You can now parse file formats like: pdf,docx,pptx,md,txt etc.