add README for hr_agent (#224)

* add README for hr_agent

* fixed sample prompt for hr_agent in README

* added screenshot and updated README.md

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Co-authored-by: Salman Paracha <salmanparacha@MacBook-Pro-261.local>

demos/hr_agent/README.md

@@ -0,0 +1,31 @@
+# HR Agent Demo
+
+This demo showcases how the **Arch** can be used to build an HR agent to manage workforce-related inquiries, workforce planning, and communication via Slack. It intelligently routes incoming prompts to the correct targets, providing concise and useful responses tailored for HR and workforce decision-making.
+
+## Available Functions:
+
+- **HR Q/A**: Handles general Q&A related to insurance policies.
+  - **Endpoint**: `/agent/hr_qa`
+
+- **Workforce Data Retrieval**: Retrieves data related to workforce metrics like headcount, satisfaction, and staffing.
+  - **Endpoint**: `/agent/workforce`
+  - Parameters:
+    - `staffing_type` (str, required): Type of staffing (e.g., `contract`, `fte`, `agency`).
+    - `region` (str, required): Region for which the data is requested (e.g., `asia`, `europe`, `americas`).
+    - `point_in_time` (int, optional): Time point for data retrieval (e.g., `0 days ago`, `30 days ago`).
+
+- **Initiate Policy**: Sends messages to a Slack channel
+  - **Endpoint**: `/agent/slack_message`
+  - Parameters:
+    - `slack_message` (str, required): The message content to be sent
+
+# Starting the demo
+1. Please make sure the [pre-requisites](https://github.com/katanemo/arch/?tab=readme-ov-file#prerequisites) are installed correctly
+2. Start Arch
+   ```sh
+   sh run_demo.sh
+   ```
+3. Navigate to http://localhost:18080/
+4. "Can you give me workforce data for asia?"
+
+![alt text](image.png)