add section on using; change spelling to US

Author: squell

README.md

@@ -9,12 +9,25 @@ This repository contains a Rust implementation of the zlib file format that is c
 
 This repository contains two public crates:
 
-* `zlib-rs`, a Rust implementation based on [zlib](https://www.zlib.net/manual.html)
-  with a safe rust API
-* `libz-rs-sys`, a zlib-compatible C API for usage in non-Rust
-  applications
+* [zlib-rs](https://crates.io/crates/zlib-rs/), a Rust implementation based on [zlib](https://www.zlib.net/manual.html)
+  with a safe rust API. This API is under development and still unstable.
+* [libz-rs-sys](https://crates.io/crates/libz-rs-sys/), a zlib-compatible C API for usage in non-Rust
+  applications.
 
-## Acknowledgement
+## How to use zlib-rs in your project
+
+zlib-rs can be used in both Rust and C projects.
+
+### Rust projects
+
+By far the easiest way to use zlib-rs is through the [flate2](https://crates.io/crates/flate2) crate, by simply enabling the `zlib-rs` feature gate. This will enable the `zlib-rs`
+backend.
+
+## C projects
+
+zlib-rs can be built as a shared object file for usage by C programs that dynamically link to zlib. Please see the example in [libz-rs-sys-cdylib](https://github.com/trifectatechfoundation/zlib-rs/tree/main/libz-rs-sys-cdylib).
+
+## Acknowledgment
 
 This project is heavily based on the [zlib](https://github.com/madler/zlib) and
 [zlib-ng](https://github.com/zlib-ng/zlib-ng) projects.