Update readme.

README.md

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 Face attendance system using face recognition with Python !
 
+## Face attendance software
+
 [![Watch the video](https://img.youtube.com/vi/z_dbnYHAQYg/0.jpg)](https://www.youtube.com/watch?v=z_dbnYHAQYg)
+
+## Spoofing feature
+
+[![Watch the video](https://img.youtube.com/vi/_KvtVk8Gk1A/0.jpg)](https://www.youtube.com/watch?v=_KvtVk8Gk1A)
+
+
+## execution
+
+- Python 3.8
+
+### windows
+
+In Windows, you will need to do a couple of additional steps before starting with this tutorial:
+- Follow the instructions described in this video https://www.youtube.com/watch?v=xaDJ5xnc8dc, from the minute 4:39 to 6:07
+- Install the packages in requirements_windows.txt.
+
+### linux, mac
+
+- Install the packages in requirements.txt
+
+## spoofing feature
+
+    git clone https://github.com/computervisiondeveloper/Silent-Face-Anti-Spoofing.git
+    pip install -r Silent-Face-Anti-Spoofing/requirements.txt
+
+Remember to add the Silent-Face-Anti-Spoofing directory to your **PYTHONPATH**.