Update README.md

README.md

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 # fftviz
-A lightweight FFT visualizer for audio files. Built with Rust + Raylib.
+A lightweight, customizable FFT visualizer for audio files. Built with Rust + Raylib.
 
-![demo image](assets/demo.png)
+![Screenshot-2024-03-04-at-24620AM](https://github.com/gursi26/fftviz/assets/75204369/9c2d919c-c28c-4021-84dd-64e86d57ae2f)
+
+![demo](https://github.com/gursi26/fftviz/assets/75204369/93b28c8f-d989-49c0-9ec3-dc3fbf7bb2ca)
+
+# Installation
+
+Install fftviz with cargo.
+```
+cargo install fftviz
+```
+
+# Usage
+- Run fftviz with a path to an audio file.
+```
+fftviz "path/to/audio/file.mp3"
+```
+
+- Use the `-h` flag for configuration options
+```
+fftviz -h
+A quick FFT visualizer for audio files
+
+Usage: fftviz [OPTIONS] <FILE_PATH>
+
+Arguments:
+  <FILE_PATH>  File path to Audio file
+
+Options:
+      --border-size <BORDER_SIZE>
+          Border size for each bar [default: 1]
+      --border-color <BORDER_COLOR>
+          Border color for each bar (in hex) [default: 000000]
+      --bar-color <BAR_COLOR>
+          Color for each bar (in hex) [default: FF0000]
+      --disable-title
+          Whether to disable printing
+      --text-color <TEXT_COLOR>
+          Color for currently playing text (in hex) [default: FFFFFF]
+      --font-size <FONT_SIZE>
+          Font size of currently playing label [default: 25]
+      --background-color <BACKGROUND_COLOR>
+          [default: 000000]
+  -h, --help
+          Print help
+  -V, --version
+          Print version
+```