added how it works section

docs/docs/optimizing-with-codeflash/benchmarking.md

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-# Benchmarks
+# Using Benchmarks
 
 Codeflash is able the determine the impact of an optimization on predefined benchmarks, when used in benchmark mode.
 
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+## How it works
+
+1. Codeflash identifies benchmarks in the benchmarks-root directory.
+
+
+2. The benchmarks are run so that runtime statistics and information can be recorded. 
+
+
+3. Replay tests are generated so the performance of optimization candidates on the exact inputs used in the benchmarks can be measured.
+
+
+4. If an optimization candidate is verified to be correct, the speedup of the optimization is calculated for each benchmark. 
+
+
+5. Codeflash then reports the impact of the optimization on each benchmark. 
+
+
+Using Codeflash with benchmarks is a great way to find optimizations that really matter.
+
+Codeflash is actively working on this feature and will be adding new capabilities in the near future!