Add LLMGraph

[abahocodes]

Adds LLMGraph to the Chatbot builder section.

LLMGraph is a no-code visual builder for LLM chatbots: design workflows on a graph canvas, add RAG over your own documents and AI agent steps, then deploy with one click to a REST API or an embeddable chat widget. It fits alongside the other hosted chatbot-building platforms in this section (Chatfuel, Flow XO, DialogFlow, etc.) and gives readers a modern LLM-native option.

Per the contribution guidelines: single suggestion, matching [package](link) - Description. format, inserted in alphabetical order, description ends with a full stop.

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[abahocodes]

Thanks for maintaining awesome-chatbots. LLMGraph turns your docs and models into support bots and RAG chatbots that ship with an embeddable chat widget, so it fits the list well. Whenever you get a chance I would appreciate a review, and I can adjust the format.