docs: add readme

README.md

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+# Dagger Runtime Benchmark
+
+This simple app illustrates the time to execution in a dagger context between:
+
+1. Container build -> Run
+1. Application Image pull -> Run
+1. Wasm runtime pull -> Download wasm binary -> Run
+1. Base image pull -> Download Binary -> Run
+
+## Run
+
+### With shuttle (Optional)
+
+```bash
+shuttle run bench
+```
+
+### With Cargo (Optional)
+
+```bash
+cargo run > reports/results.md
+```