Add Ask DeepWiki badge to README.md

Author: watrall

README.md

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 # CHARM - Market Intelligence Engine
 
 [![Docker Image Version](https://img.shields.io/docker/v/watrall/charm-market-intelligence-engine?logo=docker&label=Docker%20Hub&sort=semver&v=2)](https://hub.docker.com/r/watrall/charm-market-intelligence-engine)
+[![Ask DeepWiki](https://deepwiki.com/badge.svg)](https://deepwiki.com/watrall/charm-market-intelligence-engine)
 
 This is a clean, runnable reference implementation for automated market analysis in the cultural resource & heritage management space (designed originally to be hosted and run on a local Synology NAS).