chore: checkpoint before Python removal

vendor/flurry/benches/README.md

@@ -0,0 +1,35 @@
+## Benchmarks
+
+Currently, benchmarks following those of [`dashmap`](https://github.com/xacrimon/dashmap/tree/master/benches) and [`hashbrown`](https://github.com/rust-lang/hashbrown/blob/master/benches/bench.rs) are provided. 
+To compare against other hashmap implementations, the benchmarks located in the respective repositories may be executed. 
+Note that `flurry`, like `dashmap`, uses [`criterion`](https://docs.rs/criterion/0.3.1/criterion/) (and [`rayon`](https://docs.rs/rayon/1.3.0/rayon/) for parallel testing), while `hashbrown` uses [`test::bench`](https://doc.rust-lang.org/test/bench/index.html).
+
+To run the `flurry` benchmarks, just run
+
+```console
+$ cargo bench
+```
+
+or
+
+```console
+$ cargo bench <BENCHNAME>
+```
+
+to only run benches containing `<BENCHNAME>` in their names.
+
+To run the original `dashmap` benchmarks:
+
+```console
+$ git clone https://github.com/xacrimon/dashmap.git
+$ cd dashmap
+$ cargo bench [<BENCHNAME>]
+```
+
+To run the original `hashbrown` benchmarks:
+
+```console
+$ git clone https://github.com/rust-lang/hashbrown.git
+$ cd hashbrown
+$ cargo bench [<BENCHNAME>]
+```