Add memfree to README.md

[ahaapple]

MemFree is a hybrid AI search engine that simultaneously performs searches on your personal knowledge base (such as bookmarks, notes, documents, etc.) and the Internet.

Highlights

• Hybrid AI Search Engine
• One-Click Chrome Bookmarks Sync and Index
• Support multiple traditional search engines as source
• Self-hosted Super Fast Serverless Vector Database
• Self-hosted Super Fast Local Embedding and Rerank Service
• Full Code Open Source
• One-Click Deployment On Production

[Hannibal046]

Cool!