Add README with usage instructions and example output

README.md

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+## Domain Redirection Checker
+
+A Bash script to check the final redirection of domains from a list of URLs. The script reads URLs from a file, follows their redirections, and outputs the final domain names. If interrupted, the script can resume from the last processed URL.
+
+### Requirements
+
+- `curl` command-line tool.
+
+### Usage
+
+1. **Prepare the URLs list:**
+
+   Create a file named `domains.txt` with one domain/URL per line.
+
+   If the file does not exist, you will be prompted to provide the path to another file.
+
+3. **Run the script:**
+
+   ```bash
+   chmod +x redirect_checker.sh
+   ./redirect_checker.sh
+   ```
+
+   Note: _The maximum timeout for the `curl` command is set to 5 seconds by default. You can change this value by modifying the script (look for the `--max-time` option in the `curl` command)_.
+
+4. **View the results:**
+
+   Results will be displayed in the terminal and saved to `output.txt` in the format:
+
+   ```plaintext
+   original_url => final_domain_name
+   ```
+
+#### Example Output
+
+   ```bash
+   google.com => www.google.com
+   facebook.com => www.facebook.com
+   amazon.com => www.amazon.com
+   twitter.com => twitter.com
+   wikipedia.org => www.wikipedia.org
+   youtube.com => www.youtube.com
+   linkedin.com => www.linkedin.com
+   instagram.com => www.instagram.com
+   reddit.com => www.reddit.com
+   netflix.com => netflix.com
+   microsoft.com => www.microsoft.com
+   apple.com => www.apple.com
+   ```
+
+#### Support this Project
+
+Star ★ this repo, and we're square :nerd_face:
+
+### License
+
+This project is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported.
+
+See [LICENSE](https://creativecommons.org/licenses/by-nc-sa/3.0/) for details.