Add README.md

Author: yushulx

examples/official/README.md

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+# Dynamsoft Capture Vision SDK for Document Detection
+This repository contains example code for using the Dynamsoft Capture Vision SDK to detect documents in images.
+
+## Prerequisites
+- [Dynamsoft Capture Vision Trial License](https://www.dynamsoft.com/customer/license/trialLicense/?product=dcv&package=cross-platform)
+    
+    ```python
+    errorCode, errorMsg = LicenseManager.init_license(
+        "LICENSE-KEY")
+    ```
+    
+- SDK Installation
+ 
+    ```bash
+    pip install -r requirements.txt
+    ```
+
+
+    
+