Add disclaimer, contributing info, crate list

README.md

@@ -1,2 +1,38 @@
 # rustac
 Rust(y) implementations of the SpatioTemporal Asset Catalog (STAC) spec
+
+## Disclaimer
+
+This project was mostly a way for me to learn Rust in the context of a real project. I hope it ends
+up being useful to others, and I welcome any feedback as a Rust newbie! 
+
+Because the project is still so rough, I have not published this to [crates.io]. I plan to publish
+it if it gets to a more stable and useful state, but if it would be useful to you to have a
+published version before that, please open up an issue.
+
+## Crates
+
+The project contains the following crates, organized under a single [Cargo workspace].
+
+* **[rustac-core]** -  Core types for working with STAC objects in Rust
+* **[rustac-validate]** -  Tools for validating STAC objects using [JSON Schema]
+* **rustac-io** (*PLANNED*) - Tools for reading & writing STAC objects, including
+  resolving links
+* **rustac-extensions** (*PLANNED*) - Tools for working with [STAC Extensions]
+* **rustac** (*PLANNED*) - A consolidated entry point for the crates listed above
+
+## Contributing
+
+Contributions are welcome! Take a look at the [issues], add one of your own, or open a PR. 
+
+The "roadmap" for this project is currently guided by my own interests, skill level, and sense of 
+what might be useful. If you have suggestions for useful features or directions for the project, please open up an issue to discuss.
+
+[crates.io]: https://crates.io
+[Cargo workspace]: https://doc.rust-lang.org/book/ch14-03-cargo-workspaces.html
+[JSON Schema]: https://json-schema.org/
+[STAC Extensions]: https://stac-extensions.github.io/
+[issues]: https://github.com/duckontheweb/rustac/issues
+
+[rustac-core]: ./rustac-core
+[rustac-validate]: ./rustac-validate