add npm-sentinel server (github#25)

Author: Nekzus

servers/npm-sentinel/server.yaml

@@ -0,0 +1,14 @@
+name: npm-sentinel
+image: mcp/npm-sentinel
+type: server
+meta:
+  category: devops
+  tags:
+    - npm
+    - npm-package
+about:
+  title: NPM Sentinel
+  description: MCP server that enables intelligent NPM package analysis powered by AI. 
+  icon: https://avatars.githubusercontent.com/u/85507589?v=4
+source:
+  project: https://github.com/Nekzus/npm-sentinel-mcp