Update README: enhance features, usage, config, license, and author section

README.md

@@ -1,3 +1,68 @@
 # rssmgr
 
-Simple, minimal CLI tool for creating, managing, and generating RSS 2.0 feeds
+Simple, minimal CLI tool for creating, managing, and generating RSS 2.0 feeds.
+
+## Features
+
+- Add, update, and delete RSS feed items easily via interactive prompts
+- Supports optional links per item
+- Automatically generates valid RSS 2.0 XML file
+- Minimal dependencies: written in Bash and requires only `jq`
+- Portable and lightweight for Unix-like systems
+
+## Requirements
+
+- Bash shell
+- [jq](https://jqlang.org) (for JSON manipulation)
+
+
+## Usage
+
+1. Clone or download the script:
+
+```bash
+git clone https://src.panahifar.ir/ahp/rssmgr.git
+cd rssmgr
+```
+
+2. Make the script executable:
+
+```bash
+chmod +x rssmgr.sh
+```
+
+3. Run the script:
+
+```bash
+./rssmgr.sh
+```
+
+4. Follow the on-screen menu to manage your RSS feed items.
+
+5. The generated RSS XML file is saved as `rss_feed.xml` in the script directory.
+
+## How it works
+
+* Stores feed items in a JSON file (`rss_items.json`)
+* Uses interactive CLI prompts to add, update, or remove items
+* Generates an RSS 2.0 compliant XML feed with metadata and items
+* Supports optional `link` field for each item — can be left empty
+
+## Configuration
+
+Edit the script variables at the top to customize the feed metadata:
+
+```bash
+FEED_TITLE="My RSS Feed"
+FEED_LINK="https://example.com"
+FEED_DESC="Example RSS Feed Description"
+FEED_LANG="en-us"
+```
+
+## License
+
+This project is licensed under the MIT License. See the [LICENSE](LICENSE) file for details.
+
+## Author
+
+[Amir Husayn Panahifar](http://src.panahifar.ir/ahp)