FEAT: added demo file and generator

Author: nalmeida

docs/demo/README.md

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+# URL Tracker Demo Generator
+
+> How to generate a demo `.gif` file for the URL Tracker.
+
+## Installation
+
+> VHS requires [ttyd](https://github.com/tsl0922/ttyd) and [ffmpeg](https://ffmpeg.org/) to be installed and available on your PATH.
+
+
+[Install vhs](https://github.com/charmbracelet/vhs?tab=readme-ov-file#installation):
+
+Use a package manager:
+
+```bash
+# macOS or Linux
+brew install vhs
+
+# Arch Linux (btw)
+pacman -S vhs
+
+# Nix
+nix-env -iA nixpkgs.vhs
+
+# Windows using scoop
+scoop install vhs
+```
+
+## Usage
+
+From the `docs/demo` folder:
+```bash
+vhs demo.tape
+```
+
+This will generate the `docs/demo/demo.gif` file.
+
+![urltracker demo](./demo.gif)
+
+## Reference:
+
+- [VHS Command Reference](https://github.com/charmbracelet/vhs?tab=readme-ov-file#vhs-command-reference)

docs/demo/demo.gif

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+Output demo.gif
+Set FontSize 16
+Set LineHeight 1.6
+Set Padding 18
+Set Width 800
+Set Height 360
+
+Type "./urltracker.sh https://httpbin.org/status/200"
+Enter
+Wait
+Sleep 4
+
+Type "clear"
+Enter
+
+Sleep .5
+Type "./urltracker.sh --list list.txt"
+Enter
+Wait
+Sleep 4
+
+Type "clear"
+Enter
+
+Sleep .5
+Type "./urltracker.sh https://httpbin.org/redirect/2 --verbose"
+Enter
+Wait
+Sleep 6
+
+Type "clear"
+Enter
+
+Sleep 2
+Ctrl+C
+Enter

docs/demo/demo.tape

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+https://httpbin.org/status/200
+https://httpbin.org/redirect/2
+https://httpbin.org/status/404

docs/demo/list.txt

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+../../urltracker.sh