Extend `Cargo.toml` and `Readme.md`

Cargo.toml

@@ -1,8 +1,10 @@
 [package]
 name = "mightyohm-gc-exporter"
 version = "0.1.0-dev"
+authors = ["finga <finga@onders.org>"]
 edition = "2021"
-description = "Prometheus exporter for the MightyOhm Geiger Counter"
+description = "Prometheus exporter for the MightyOhm Geiger Counter."
+readme = "README.md"
 license = "GPL-3.0-or-later"
 repository = "https://git.onders.org/finga/mightyohm-gc-exporter"
 keywords = ["prometheus", "metrics"]

README.md

@@ -2,14 +2,53 @@
 A Prometheus exporter for the [MightyOhm Geiger Counter](https://mightyohm.com/blog/products/geiger-counter/).
 
 ## Build
+Cargo, the Rust package manager, is used to build this project.
+
 ### Same architecture as system
-To compile it for the same architecture as the build system:
+Compile it for the same architecture as the build system:
 ```sh
 cargo build --release
 ```
 
-### Cross-compile for aarch64 (recent RaspberryPi)
-To cross-compile it for RaspberryPi:
+### Cross-compile for amd64 (recent RaspberryPi)
+Cross-compile it for the amd64 architecture:
 ```sh
 PKG_CONFIG_SYSROOT_DIR=/usr/aarch64-linux-gnu cargo build --target aarch64-unknown-linux-gnu --release
 ```
+
+## Debian
+To build a package for Debian, Raspbian, and so on,
+[`cargo-deb`](https://crates.io/crates/cargo-deb) can be used.
+
+The package comes with an automatically started and enabled systemd
+service unit which can be configured via
+`/etc/default/mightyohm-gc-exporter`.
+
+### Same architecture as system
+Build a `deb` package for the same architecture as the build system:
+```sh
+cargo deb
+```
+
+### Cross-compile for amd64 (recent RaspberryPi)
+Build a `deb` package for the amd64 architecture:
+```sh
+PKG_CONFIG_SYSROOT_DIR=/usr/aarch64-linux-gnu cargo deb --target aarch64-unknown-linux-gnu
+```
+
+## Usage
+```
+USAGE:
+    mightyohm-gc-exporter [OPTIONS]
+
+OPTIONS:
+    -a, --address <ADDRESS>            The IPv4 or IPv6 address where the metrics are served
+                                       [default: 127.0.0.1]
+    -b, --baud-rate <BAUD_RATE>        The baudrate of the serial connection [default: 9600]
+    -h, --help                         Print help information
+    -p, --port <PORT>                  The port where the metrics are served [default: 9111]
+    -s, --serial-port <SERIAL_PORT>    The port of the serial device, usually in '/dev/...'
+                                       [default: /dev/serial0]
+    -t, --timeout <TIMEOUT>            Timeout of the serial connection in ms [default: 1000]
+    -V, --version                      Print version information
+```