From my referer logs:
http://www.google.com/search?hl=en&q=postgresql+frontier+extension+documentation
You have come to the right place, except the documentation for my PostgreSQL extension has not been written yet. However, that is going to change until the next version, scheduled for release later this week. This version will implement connection pooling and an easier-to-use high-level interface for executing queries and obtaining query results.