reference rust-gather-cidr-map as example

Author: stbuehler

README.md

@@ -3,9 +3,15 @@
 [![crates.io](https://img.shields.io/crates/v/cidr.svg)](https://crates.io/crates/cidr)
 [![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE)
 
+# cidr crate
+
 This library provides types to represent an IP network (`Cidr`) or an IP
 host withing a network (`Inet`).
 
 The naming follows the names of the [PostgreSQL data types](https://www.postgresql.org/docs/current/static/datatype-net-types.html)
 
 The documentation for `master` is located at [https://stbuehler.github.io/rustdocs/cidr/cidr/](https://stbuehler.github.io/rustdocs/cidr/cidr/); released versions are documented at [https://docs.rs/cidr](https://docs.rs/cidr).
+
+## Examples
+
+- example making good use of the `bitstring` feature and the `bitstring-trees` crate: https://github.com/stbuehler/rust-gather-cidr-map