Add badges for license, status, and Go report

Author: JaredHatfield

README.md

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+[![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://opensource.org/licenses/MIT) [![Concept](https://img.shields.io/badge/Status-Concept-white)](https://guide.unitvectorylabs.com/bestpractices/status/#concept) [![Go Report Card](https://goreportcard.com/badge/github.com/UnitVectorY-Labs/mcp-markdown-rag)](https://goreportcard.com/report/github.com/UnitVectorY-Labs/mcp-markdown-rag)
+
 # mcp-markdown-rag
 A local-first command-line tool for indexing and semantically searching Markdown documents using vector embeddings and a self-contained vector database.