Add DeepWiki badge to README

Added a badge linking to DeepWiki for HDP Cairo.

Author: kacperkozi

README.md

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 # HDP Cairo
 
+<a href="https://deepwiki.com/HerodotusDev/hdp-cairo"><img src="https://deepwiki.com/badge.svg" alt="Ask DeepWiki"></a>
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 HDP (Herodotus Data Processor) is a modular framework for validating on-chain data from multiple blockchain RPC sources, executing user-defined logic written in Cairo1, and producing an execution trace that can be used to generate a zero-knowledge proof. The proof attests to the correctness of both the on-chain data and the performed computation.
 
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