Updated README.md and documentation about "color" feature.

Author: azriel91

Diff for: README.md

@@ -27,6 +27,19 @@ Rust's log levels map to the browser's console log in the following way.
 | `warn!()`  | `console.warn()`  |
 | `error!()` | `console.error()` |
 
+## Colors
+
+The `"color"` feature adds styling to the log messages.
+
+`Cargo.toml`
+```toml
+console_log = { version = "0.1", features = ["color"] }
+```
+
+The styled log messages will be rendered as follows:
+
+![Styled log messages](img/log_messages_styled.png)
+
 ## Code Size
 
 [Twiggy](https://github.com/rustwasm/twiggy) reports this library adding about

Diff for: img/log_messages_styled.png

@@ -35,6 +35,19 @@
 //! formatting of log messages (timestamps, file and line info, etc.) this crate can be used with
 //! the [`fern`] logger via the [`console_log::log`] function.
 //!
+//! ## Colors
+//!
+//! The `"color"` feature adds styling to the log messages.
+//!
+//! `Cargo.toml`
+//! ```toml
+//! console_log = { version = "0.1", features = ["color"] }
+//! ```
+//!
+//! The styled log messages will be rendered as follows:
+//!
+//! ![Styled log messages](img/log_messages_styled.png)
+//!
 //! # Code Size
 //!
 //! [Twiggy] reports this library adding about 180Kb to the size of a minimal wasm binary in a