update

Author: MissPenguin

doc/doc_ch/android_demo.md

@@ -0,0 +1,27 @@
+# Project Clone
+
+## 1. Clone PaddleOCR
+
+```bash
+# Recommend
+git clone https://github.com/PaddlePaddle/PaddleOCR
+
+# If you cannot pull successfully due to network problems, you can switch to the mirror hosted on Gitee:
+
+git clone https://gitee.com/paddlepaddle/PaddleOCR
+
+# Note: The mirror on Gitee may not keep in synchronization with the latest project on GitHub. There might be a delay of 3-5 days. Please try GitHub at first.
+```
+
+## 2. Install third-party libraries
+
+```bash
+cd PaddleOCR
+pip3 install -r requirements.txt
+```
+
+If you getting this error `OSError: [WinError 126] The specified module could not be found` when you install shapely on windows.
+
+Please try to download Shapely whl file from [http://www.lfd.uci.edu/~gohlke/pythonlibs/#shapely](http://www.lfd.uci.edu/~gohlke/pythonlibs/#shapely).
+
+Reference: [Solve shapely installation on windows](https://stackoverflow.com/questions/44398265/install-shapely-oserror-winerror-126-the-specified-module-could-not-be-found)