Add more image formats, update docs

Author: hilli

README.md

@@ -1,6 +1,6 @@
 # icat
 
-Go version of image cat (or `imgcat`) with `webp`, `tiff` and (optional) `HEIF` image support (on top of standard Go images formats `gif`, `jpg`, `png`) and URL support and fallback to ASCII art.
+Go version of image cat (or `imgcat`) with `bmp`, `riff`,`tiff`, `vp8`, `vp8l`, `webp` and (optional) `HEIF` image support (on top of standard Go images formats `gif`, `jpg`, `png`) and URL support and fallback to ASCII art.
 `PrintImageFile` and `PrintImageURL` will print the image to the terminal, trying to figure out which terminal you are using and fallback to ASCII art if the terminal does not support images.
 
 ## Cmd line version
@@ -9,8 +9,26 @@ Go version of image cat (or `imgcat`) with `webp`, `tiff` and (optional) `HEIF`
 
 ```shell
 go install github.com/hilli/icat/cmd/icat@latest
+# With HEIF support:
+go install -tags heif github.com/hilli/icat/cmd/icat@latest
 ```
 
+*Note*: To enable `heif` support, you need to have `libheif` installed on your system. On macOS, you can install it via Homebrew:
+
+```shell
+brew install libheif
+```
+
+`libheif` should be available on most package managers.
+
+Alternatively, you can download the binary from the [releases page](https://github.com/hilli/icat/releases) or install via [Homebrew](https://brew.sh/):
+
+```shell
+brew install hilli/tap/icat
+```
+
+which unfortunately does not support the `heif` files (Cross compilation is hard with C extensions, mkay).
+
 ### CLI Usage
 
 ```shell

print_image.go

@@ -15,7 +15,10 @@ import (
 	ascii "github.com/qeesung/image2ascii/convert"
 
 	_ "golang.org/x/image/bmp"
+	_ "golang.org/x/image/riff"
 	_ "golang.org/x/image/tiff"
+	_ "golang.org/x/image/vp8"
+	_ "golang.org/x/image/vp8l"
 	_ "golang.org/x/image/webp"
 )