docs: update supported image formats

Author: 0x6b

Cargo.toml

@@ -2,7 +2,7 @@
 name = "gbc-image-transform"
 version = "0.1.0"
 edition = "2021"
-description = "Generate Game Boy Color lookalike images from a PNG image."
+description = "Generate Game Boy Color lookalike image from an image."
 
 [dependencies]
 # for easier error handling

README.md

@@ -1,6 +1,6 @@
 # gbc-image-transform
 
-A CLI to generate Game Boy Color lookalike images from a PNG image.
+A CLI to generate Game Boy Color lookalike images from an image.
 
 The Game Boy Color can display any combination of 32,768 different colors (15-bit RGB), but at any given time, it can display only up to 56 different colors (ref.: [Game Boy Color - Wikipedia](https://en.wikipedia.org/wiki/Game_Boy_Color#Technical_specifications)).
 
@@ -39,6 +39,10 @@ Options:
           Print version
 ```
 
+### Supported Image Formats
+
+The CLI should support any image format supported by the [image](https://crates.io/crates/image) crate, but tested with JPEG and PNG. The format is determined from the `path`'s file extension.
+
 ## License
 
 MIT. See [LICENSE](LICENSE) for details.