add faq

deploy/lite/readme.md

@@ -263,3 +263,14 @@ use_direction_classify  1  # 是否使用方向分类器，0表示不使用，1
 <div align="center">
     <img src="../imgs/demo.png" width="600">
 </div>
+
+
+## FAQ
+Q1：如果想更换模型怎么办，需要重新按照流程走一遍吗？
+A1：如果已经走通了上述步骤，更换模型只需要替换 .nb 模型文件即可，同时要注意字典更新
+
+Q2：换一个图测试怎么做？
+A2：替换debug下的.jpg测试图像为你想要测试的图像，adb push 到手机上即可
+
+Q3：如何封装到手机APP中？
+A3：此demo旨在提供能在手机上运行OCR的核心算法部分，PaddleOCR/deploy/android_demo是将这个demo封装到手机app的示例，供参考

deploy/lite/readme_en.md

@@ -220,3 +220,15 @@ The outputs are as follows:
 <div align="center">
     <img src="../imgs/demo.png" width="600">
 </div>
+
+## FAQ
+
+Q1: What if I want to change the model, do I need to run it again according to the process?
+A1: If you have performed the above steps, you only need to replace the .nb model file to complete the model replacement.
+
+Q2: How to test with another picture?
+A2: Replace the .jpg test image under `./debug` with the image you want to test, and run `adb push` to push new image to the phone.
+
+Q3: How to package it into the mobile APP?
+A3: This demo aims to provide the core algorithm part that can run OCR on mobile phones.  Further,
+PaddleOCR/deploy/android_demo is an example of encapsulating this demo into a mobile app for reference.