Document how to enable and use computer operator in operator readme

src/khoj/processor/operator/README.md

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+# Khoj Operator (Experimental)
+
+## Overview
+Give Khoj its own computer to operate in a transparent, controlled manner. Accomplish tasks that require visual browsing, file editing and terminal access. Operator with research mode can work for 30+ minutes to accomplish more substantial tasks like feature development, travel planning, shopping etc.
+
+## Setup
+
+### Prerequisites
+- Docker and Docker Compose installed
+- Anthropic API key (required - only Anthropic models currently enabled)
+
+### Installation Steps
+1. Download the Khoj docker-compose.yml file
+    ```shell
+    mkdir ~/.khoj && cd ~/.khoj
+    wget https://raw.githubusercontent.com/khoj-ai/khoj/master/docker-compose.yml
+    ```
+
+2. Configure environment variables in `docker-compose.yml`
+    - Set `ANTHROPIC_API_KEY` to your [Anthropic API key](https://console.anthropic.com/settings/keys)
+    - Uncomment `KHOJ_OPERATOR_ENABLED=True` to enable the operator tool
+
+3. Start Khoj services
+    ```shell
+    docker-compose up
+    ```
+
+4. Access the web app at http://localhost:42110
+   Ensure you're using a claude 3.7+ models on your [settings page](http://localhost:42110/settings)
+
+## Usage
+Use the `/operator` command or ask Khoj in normal or research mode to use the operator tool to have it operate its computer:
+
+**Examples:**
+- `/operator Find flights from Bangkok to Mexico City with no US layover`
+- `/research Clone the khoj repo and tell me how the operator tool is implemented`
+
+## Supported Models
+
+Currently enables **only Anthropic models**:
+- Claude Sonnet 4
+- Claude 3.7 Sonnet
+- Claude Opus 4
+
+*Note: OpenAI and other operator models are disabled while in developemnt.*
+
+## Capabilities
+
+The operator can:
+- **Computer Control**: Take screenshots, click, type, navigate desktop
+- **File Operations**: Create, edit, and manage files
+- **Terminal Access**: Execute bash commands and scripts
+- **Web Browsing**: Navigate websites, documents and extract information
+
+## Architecture
+
+- **Environments**: Operator Computer and Browser environments
+- **Models**: Enable Vision Language Models (VLM) to operate computer
+- **Execution**: Containerize computer environment for security and isolation