Add ProductPlan MCP server to Community Servers

ProductPlan MCP server enables AI assistants to interact with ProductPlan
roadmaps, OKRs, and discovery features through the Model Context Protocol.

Repository: https://github.com/olgasafonova/productplan-mcp-server

Author: Olga Safonova

README.md

@@ -1219,6 +1219,7 @@ search, and comprehensive file analysis.
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+- **[ProductPlan](https://github.com/olgasafonova/productplan-mcp-server)** - MCP server for ProductPlan - enables AI assistants to interact with roadmaps, OKRs, and discovery features.
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