expand benchmarking README

Author: dario-piotrowicz

benchmarking/README.md

@@ -1,6 +1,16 @@
 # Benchmarking
 
-This directory contains a script for running full end to end benchmarks again the example applications
+This directory contains a script for running full end to end benchmarks against the example applications.
+
+What the script does:
+
+- takes all the example applications from the [`./examples` directory](../examples/)
+  (excluding the ones specified in the `exampleAppsNotToBenchmark` set in [`./src/cloudflare.ts`](./src/cloudflare.ts))
+- in parallel for each application:
+  - builds the application by running its `build:worker` script
+  - deploys the application to production (with `wrangler deploy`)
+  - takes the production deployment url
+  - benchmarks the application's response time by fetching from the deployment url a number of times
 
 > [!note]
 > This is the first cut at benchmarking our solution, later we can take the script in this directory,