Add README.md

Author: yushulx

examples/official/fastapi/README.md

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+# Barcode Reader Web Application 
+A web application that leverages [FastAPI](https://pypi.org/project/fastapi/) for the backend along with a lightweight **HTML/JavaScript** frontend. The application allows users to upload images for **barcode reading**, decodes the barcodes using the [Dynamsoft Capture Vision Bundle](https://pypi.org/project/dynamsoft-capture-vision-bundle/), and presents the decoded data in a user-friendly interface.
+
+## Features
+
+- Upload images containing barcodes.
+- Detect and decode barcodes using the Dynamsoft Capture Vision Bundle.
+- Display barcode details, including type, content, and location.
+- Visualize barcode locations on the uploaded image.
+
+## Prerequisites
+
+- Python 3.8 or higher
+- [Dynamsoft Capture Vision Bundle license](https://www.dynamsoft.com/customer/license/trialLicense/?product=dcv&package=cross-platform)
+
+## Getting Started
+1. Download the source code from the repository.
+2. Install the required dependencies using pip. 
+
+    ```bash
+    pip install -r requirements.txt
+    ```
+
+3. Set the license key in `backend.py`:
+
+    ```python
+    license_key = "LICENSE-KEY"
+    ```
+
+4. Run the project:
+    
+    ```bash
+    python backend.py
+    ```
+
+5. Open your web browser and navigate to `http://localhost:8000` to access the application.