update readme

README.md

@@ -9,3 +9,25 @@
 This project is still *work-in-progress*. But it is already working in some production environments and serves numbers of domain names. Furthermore it dramatically outperforms NGINX and Caddy in the setting of very simple HTTP reverse-proxy scenario (See [`bench`](./bench/) directory).
 
  `rpxy` provides the sanitization of TLS's SNI (server name indication) in default by correctly binding a certificate used to establish an underlying TLS connection with backend application specified in the overlaid HTTP HOST header (or URL in Request line). Additionally, as a somewhat unstable feature, our `rpxy` can handle the brand-new HTTP/3 connection thanks to [`quinn`](https://github.com/quinn-rs/quinn) and [`hyperium/h3`](https://github.com/hyperium/h3).
+
+## Making an executable binary
+
+```:bash
+% cargo build --release
+```
+
+Then you have a binary at `./target/release/rpxy`.
+
+You can also use [`docker` image](https://hub.docker.com/r/jqtype/rpxy) instead of building from the source.
+
+## Usage
+
+todo!
+
+## Configuration
+
+todo!
+
+## Using `docker` image
+
+todo!