docs: make readme more descriptive (#252)

* docs: make readme more descriptive

* Update README.md

* Update README.md

Co-authored-by: David <dvdplm@gmail.com>

* Update README.md

Co-authored-by: David <dvdplm@gmail.com>

* Add more projects

* Update README.md

* Update README.md

Co-authored-by: David <dvdplm@gmail.com>

README.md

 # jsonrpsee
 
-JSON-RPC crate using async/await.
+JSON-RPC library designed for async/await in Rust.
+
 Designed to be the successor to [ParityTech's JSONRPC crate](https://github.com/paritytech/jsonrpc/).
 
-Use `cargo doc` to generate the documentation of this crate.
+Support `WebSocket` and `HTTP` transports for both client and server.
+
+## Under development
+
+The library is still under development; do not use in production.
+
+## Sub-projects
+- [jsonrpsee-http-client](./http-client) [![crates.io][ws-client-image]][ws-client-url]
+- [jsonrpsee-http-server UNSTABLE/NOT RELEASED](./http-server) [![crates.io][http-server-image]][http-server-url]
+- [jsonrpsee-proc-macros](./proc-macros) [![crates.io][proc-macros-image]][proc-macros-url]
+- [jsonrpsee-ws-client](./ws-client) [![crates.io][ws-client-image]][ws-client-url]
+- [jsonrpsee-ws-server UNSTABLE/NOT RELEASED](./http-server) [![crates.io][http-server-image]][http-server-url]
+
+
+[http-client-image]: https://img.shields.io/crates/v/jsonrpsee-http-client.svg
+[http-client-url]: https://crates.io/crates/jsonrpsee-http-client
+[http-server-image]: https://img.shields.io/crates/v/jsonrpsee-http-server.svg
+[http-server-url]: https://crates.io/crates/jsonrpsee-http-server
+[proc-macros-url]: https://crates.io/crates/jsonrpsee-proc-macros
+[proc-macros-image]: https://img.shields.io/crates/v/jsonrpsee-proc-macros.svg
+[ws-client-image]: https://img.shields.io/crates/v/jsonrpsee-ws-client.svg
+[ws-client-url]: https://crates.io/crates/jsonrpsee-ws-client
+[ws-server-image]: https://img.shields.io/crates/v/jsonrpsee-ws-server.svg
+[ws-server-url]: https://crates.io/crates/jsonrpsee-ws-server
+
+## Examples
+
+- [HTTP](./examples/examples/http.rs)
+- [WebSocket](./examples/examples/ws.rs)
+- [WebSocket pubsub](./examples/examples/ws_subscription.rs)
+
+## Roadmap
+
+See [tracking issue for next stable release](https://github.com/paritytech/jsonrpsee/issues/251)
+
+## Users
+
+If your project uses `jsonrpsee` we would like to know. Please open a pull request and add your project to the list below:
+- [substrate-subxt](https://github.com/paritytech/substrate-subxt)
+- [parity bridges common](https://github.com/paritytech/parity-bridges-common)
+- [remote externalities](https://github.com/paritytech/substrate/tree/master/utils/frame/remote-externalities)