Add dbbenchmark URL to db-benchmark readme (#5503)

I was researching benchmarks as part of #5502 and I had to do some digging to figure out what dbenchmark was
apache · Mar 9, 2023 · 07b07d5 · 07b07d5
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diff --git a/benchmarks/db-benchmark/README.md b/benchmarks/db-benchmark/README.md
@@ -19,6 +19,8 @@
 
 # Run db-benchmark
 
+This directory contains scripts for running DataFusion with the https://github.com/h2oai/db-benchmark
+
 ## Directions
 
 Run the following from root `arrow-datafusion` directory