add MCP server badge

Author: punkpeye

README.md

@@ -2,6 +2,10 @@
 
 <img src="https://github.com/negokaz/excel-mcp-server/blob/main/docs/img/icon-800.png?raw=true" width="128">
 
+<a href="https://glama.ai/mcp/servers/@negokaz/excel-mcp-server">
+  <img width="380" height="200" src="https://glama.ai/mcp/servers/@negokaz/excel-mcp-server/badge" alt="Excel Server MCP server" />
+</a>
+
 [![NPM Version](https://img.shields.io/npm/v/@negokaz/excel-mcp-server)](https://www.npmjs.com/package/@negokaz/excel-mcp-server)
 [![smithery badge](https://smithery.ai/badge/@negokaz/excel-mcp-server)](https://smithery.ai/server/@negokaz/excel-mcp-server)
 
@@ -165,4 +169,4 @@ The maximum number of cells to read in a single paging operation.
 
 Copyright (c) 2025 Kazuki Negoro
 
-excel-mcp-server is released under the [MIT License](LICENSE)
+excel-mcp-server is released under the [MIT License](LICENSE)