Add privacy policy document: outline data collection practices and user privacy measures

PRIVACY.md

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+# Privacy Policy
+
+ANTI-BS is designed to operate entirely locally in the user’s browser.  
+The extension is built with a strong focus on user privacy and transparency.
+
+## Data Collection
+
+ANTI-BS does **not** collect, transmit, or share any personal data.
+
+The extension does **not** collect or process:
+- Personal or identifiable information
+- Browsing history
+- Authentication or account data
+- Location data
+- Website content
+- User activity metrics
+- Analytics or telemetry
+
+## Local Storage
+
+ANTI-BS uses the browser’s local storage (`chrome.storage.local`) solely to store user-defined configuration, including:
+- The channel whitelist
+- The optional debug logging preference
+
+This data:
+- Remains entirely on the user’s device
+- Is never transmitted to external servers
+- Can be removed at any time by clearing extension data
+
+## Network Access
+
+ANTI-BS does **not**:
+- Send network requests
+- Communicate with external services
+- Load or execute remote code
+
+All functionality is implemented using code bundled with the extension and executed locally.
+
+## Transparency
+
+The source code of ANTI-BS is publicly available and may be reviewed to verify its behavior:
+
+- **Source repository:** https://git.chipperfluff.at/projects/ANTI-BS
+
+## Contact
+
+For information about the project or its behavior, please refer to the source repository listed above.
+
+---
+
+Last updated: 2026