docs: add new documentation for application tracking SDK

Author: moonrailgun

website/docs/application/_category_.json

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+{
+  "label": "Application",
+  "position": 12
+}

website/docs/application/tracking.md

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+---
+sidebar_position: 1
+---
+
+# Application Tracking
+
+Tianji provides a powerful SDK for tracking events and user behavior in your applications. This guide explains how to integrate and use the Application Tracking SDK in your projects.
+
+## Installation
+
+Install the Tianji react native SDK in your project:
+
+```bash
+npm install tianji-react-native
+# or
+yarn add tianji-react-native
+# or
+pnpm add tianji-react-native
+```
+
+## Initialization
+
+Before using any tracking features, you need to initialize the Application SDK with your Tianji server URL and application ID:
+
+```ts
+import { initApplication } from 'tianji-react-native';
+
+initApplication({
+  serverUrl: 'https://tianji.example.com',  // Your Tianji server URL
+  applicationId: 'your-application-id'       // Your application identifier
+});
+```
+
+## Tracking Events
+
+You can track custom events in your application to monitor user actions and behaviors:
+
+```ts
+import { reportApplicationEvent } from 'tianji-react-native';
+
+// Track a simple event
+reportApplicationEvent('Button Clicked');
+
+// Track an event with additional data
+reportApplicationEvent('Purchase Completed', {
+  productId: 'product-123',
+  price: 29.99,
+  currency: 'USD'
+});
+```
+
+## Screen Tracking
+
+Track screen views in your application to understand user navigation patterns:
+
+### Setting Current Screen
+
+You can set the current screen information which will be included in subsequent events:
+
+```ts
+import { updateCurrentApplicationScreen } from 'tianji-react-native';
+
+// Update current screen when user navigates
+updateCurrentApplicationScreen('ProductDetails', { productId: 'product-123' });
+```
+
+### Reporting Screen Views
+
+Explicitly report screen view events:
+
+```ts
+import { reportApplicationScreenView } from 'tianji-react-native';
+
+// Report current screen view
+reportApplicationScreenView();
+
+// Or report a specific screen view
+reportApplicationScreenView('Checkout', { cartItems: 3 });
+```
+
+## User Identification
+
+Identify users in your application to track their behavior across sessions:
+
+```ts
+import { identifyApplicationUser } from 'tianji-react-native';
+
+// Identify a user with their information
+identifyApplicationUser({
+  id: 'user-123',          // Unique user identifier
+  email: '[email protected]',
+  name: 'John Doe',
+  // Add any other user properties
+  plan: 'premium',
+  signupDate: '2023-01-15'
+});
+```
+
+## API Reference
+
+### `initApplication(options)`
+
+Initializes the application tracking SDK.
+
+**Parameters:**
+
+- `options`: ApplicationTrackingOptions
+  - `serverUrl`: Your Tianji server URL (e.g., 'https://tianji.example.com')
+  - `applicationId`: Your application identifier
+
+### `reportApplicationEvent(eventName, eventData?, screenName?, screenParams?)`
+
+Sends an application event to the Tianji server.
+
+**Parameters:**
+
+- `eventName`: Name of the event (max 50 chars)
+- `eventData`: (Optional) Event data object
+- `screenName`: (Optional) Screen name to override current screen
+- `screenParams`: (Optional) Screen parameters to override current screen params
+
+### `updateCurrentApplicationScreen(name, params)`
+
+Updates the current application screen information.
+
+**Parameters:**
+
+- `name`: Screen name
+- `params`: Screen parameters object
+
+### `reportApplicationScreenView(screenName?, screenParams?)`
+
+Sends a screen view event to the Tianji server.
+
+**Parameters:**
+
+- `screenName`: (Optional) Screen name to override current screen
+- `screenParams`: (Optional) Screen parameters to override current screen params
+
+### `identifyApplicationUser(userInfo)`
+
+Identifies a user in the application.
+
+**Parameters:**
+
+- `userInfo`: User identification data object
+
+## Payload Limitations
+
+- Language information: max 35 characters
+- Operating system information: max 20 characters
+- URL information: max 500 characters
+- Event name: max 50 characters