Add project documentation

Author: MeowDump

README.md

@@ -1,16 +1,39 @@
-# Project Template
+# NetBlock
 
-This repository serves as a template for starting new magisk/ksu/apatch modules.
+A per-app internet firewall for Android using KernelSU/Magisk. Block internet access for specific apps while keeping others connected.
 
-## Usage
+## Features
+
+- **Per-App Blocking** : Toggle internet access per app via WebUI
+- **System & User Apps** : Block both user-installed and system apps
+- **IPv4/IPv6 Support** : Blocks all traffic on both protocols
+- **Backup/Restore** : Export/import blocklists config (path: `/sdcard/Downloads`)
+- **Auto-Verification** : Service monitors and restores rules if cleared
 
-Use the **"Use this template"** button to create a new repository based on this template.
+## Installation
 
-## Important
+1. Flash module in KernelSU/Magisk/Apatch Manager
+2. Reboot device
+3. Launch NetBlock from WebUI
+4. Toggle apps to block/unblock internet access
+
+## Usage
 
-Please do **not** fork this repository.
-Forking is not the intended workflow and may cause unnecessary linkage to the original template.
+| Action | Description |
+|--------|-------------|
+| Toggle Switch | Block/unblock app internet |
+| Refresh | Reload app list |
+| User/System | Switch between user and system apps |
+| Verify | Check if iptables rules are active |
+| Clear All | Remove all blocks instantly |
+| Backup | Export/import blocklist as JSON |
 
-## License
+## Note
+- **Magisk Users**: Install [KSU WebUI](https://github.com/5ec1cff/KsuWebUIStandalone/releases) and grant root permission to use WebUI interface
 
-MIT
+## Preview
+<table align="center">
+  <tr>
+    <td><img src="https://github.com/MeowDump/NetBlock/blob/main/assets/1.png" alt="1" style="max-width: 100%; height: auto;" /></td>
+  </tr>
+</table>