Add airbnb search server. (github#12)

Author: cmrigney

servers/openbnb-airbnb/server.yaml

@@ -0,0 +1,15 @@
+name: openbnb-airbnb
+image: mcp/openbnb-airbnb
+type: server
+meta:
+  category: search
+  tags:
+    - airbnb
+    - openbnb
+about:
+  title: Airbnb Search
+  description: MCP Server for searching Airbnb and get listing details.
+  icon: https://avatars.githubusercontent.com/u/202564951?v=4
+source:
+  project: https://github.com/openbnb-org/mcp-server-airbnb
+