Add helpful hints section to readme

README.md

diff --git a/README.md b/README.md
index d0fa9b9..2a87466 100644
--- a/README.md
+++ b/README.md
@@ -75,3 +75,7 @@
     func handleRequest(w http.ResponseWriter, r *http.Request) {
       // respond to request
     }
+
+# Helpful Hints
+
+* Use `export APID_DATA_TRACE_LOG_LEVEL=debug` to see DB Tracing