Add CLI section to README

README.md

@@ -2,11 +2,21 @@
 
 ![ci](https://github.com/matusf/z-base-32/actions/workflows/ci.yml/badge.svg)
 
-The `z-base-32` is a human oriented base32 encoding.
+The `z-base-32` is a human-oriented base-32 encoding.
 
-## API
+## Rust
 
-The library exposes two functions with following signatures and error type:
+### Crate
+
+#### Installation
+
+```sh
+cargo add z-base-32
+```
+
+#### API
+
+The library exposes two functions with the following signatures and an error type:
 
 ```rs
 pub fn encode(input: &[u8]) -> String;
@@ -16,7 +26,7 @@ pub fn decode(input: &str) -> Result<Vec<u8>, DecodeError>;
 pub struct DecodeError;
 ```
 
-### Example
+#### Example
 
 ```rs
 use zbase32::{encode, decode};
@@ -28,11 +38,49 @@ fn main() {
 }
 ```
 
+### CLI
+
+This project also provides a CLI utility with a similar interface to the well-known `base64` command.
+
+#### Installation
+
+To install `z-base-32` CLI you can build it from source or download prebuild binary from [releases](https://github.com/matusf/z-base-32/releases/latest).
+
+```console
+cargo install --features cli z-base-32
+```
+
+#### Example
+
+```console
+$ zbase32 -h
+z-base-32: human-oriented base-32 encoding
+
+Usage: zbase32 [OPTIONS] [FILE]
+
+Arguments:
+  [FILE]  File to encode or decode
+
+Options:
+  -d, --decode       Decode data
+  -w, --wrap <WRAP>  Wrap encoded lines after COLS character [default: 76]
+  -h, --help         Print help
+  -V, --version      Print version
+```
+
 ## Python
 
+### Installation
+
+The `z-base-32` package is published at [PyPI](https://pypi.org/project/z-base-32/). Install it using the following command:
+
+```console
+pip install z-base-32
+```
+
 ### Building
 
-This crate can be compiled with feature flag `python` in which case it produces Python bindings. To build a Python wheels use [`maturin`](https://github.com/PyO3/maturin):
+This crate can be compiled with the feature flag `python` in which case it produces Python bindings. To build Python wheels use [`maturin`](https://github.com/PyO3/maturin):
 
 ```console
 maturin build
@@ -48,7 +96,7 @@ def decode(input: str) -> bytes:
 class DecodeError(Exception):
 ```
 
-#### Example
+### Example
 
 ```py
 import zbase32