Add criterion benchmarking

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README.md

@@ -13,3 +13,19 @@ To run in super-fast prod mode: `cargo run --release`.
 To run with debug logs enabled: `RUST_LOG=debug cargo run`.
 
 To run the tests against included test input files: `RUST_LOG=debug cargo test -- --no-capture`.
+
+## Benchmarks
+
+Because this is over-engineered, I've included benchmarks for each day's solution. Because, why not?
+
+To run benchmarks: `cargo bench`.
+
+### Results
+
+These were all run on my personal machine, an AMD Ryzen 9 3900X 12-Core Processor with 32 GB RAM, on Linux (WSL).
+
+Timings are given as: [lower-bound **best-estimate** upper-bound]
+
+| Day | Part 1 | Part 2 |
+|-----|--------|--------|
+| 01  | [101.34 µs **101.95 µs** 102.61 µs] | [105.90 µs **106.40 µs** 106.95 µs] |