Added README and release workflow for versioning

README.md

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+# JSON Content Formatter
+
+A Chrome extension that formats JSON in the current tab, highlights with
+highlight.js, linkifies URLs, and offers collapsible views and line numbers.
+
+## Features
+- Auto format (optional) for supported content types.
+- Manual format via toolbar icon or context menu.
+- Theme selection (light/dark + highlight.js theme).
+- Line numbers toggle.
+- Collapsible blocks for JSON, YAML, XML, and Markdown.
+
+## Supported Languages
+Defaults to JSON only. Enable additional languages in options:
+- JSON
+- Markdown
+- Plaintext
+- XML
+- YAML
+
+## Usage
+1. Load the extension via `chrome://extensions` (Developer mode > Load unpacked).
+2. Open the extension options to configure:
+   - Auto format
+   - Theme mode and highlight theme
+   - Line numbers
+   - Enabled languages
+3. Use:
+   - Toolbar icon click to format the current tab
+   - Right-click the icon > "Einstellungen" to open options
+   - Right-click the page > "JSON jetzt formatieren"
+
+## Notes
+- Auto format requires host permissions to read page content.
+- Manual formatting uses language auto-detection only for enabled languages.