Updata README files

02__Interact_Debug_&_Pipeline/README.md

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 ## <a href="./" style="text-decoration:none">Step 02: Interact, Debug & Pipeline</a>
 [![IMAGE ALT TEXT HERE](https://img.youtube.com/vi/Gyd-q4NAI7U/0.jpg)](https://www.youtube.com/watch?v=Gyd-q4NAI7U&list=PLTuWbByD80TORd1R-J7j7nVQ9fot3C2fK)
 
+#### <a href="https://www.youtube.com/watch?v=Gyd-q4NAI7U&list=PLTuWbByD80TORd1R-J7j7nVQ9fot3C2fK">YouTube Video Tutorial for Step_02</a>
 
+#### <a href="https://www.bilibili.com/video/BV1TM411b7JY/" >Bilibili Video Tutorial for Step_02</a>
 
 <img src="sl_02__Summary.png" alt="isolated" width="1080"/>

03__DeveloperFoci_NeatBlanks_&_GUI_HelloWorld/README.md

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 [![IMAGE ALT TEXT HERE](https://img.youtube.com/vi/tOldfUkSecI/0.jpg)](https://www.youtube.com/watch?v=tOldfUkSecI&list=PLTuWbByD80TORd1R-J7j7nVQ9fot3C2fK)
 
+#### <a href="https://www.youtube.com/watch?v=tOldfUkSecI&list=PLTuWbByD80TORd1R-J7j7nVQ9fot3C2fK" >YouTube Video Tutorial for Step_03</a>
 
+#### <a href="https://www.bilibili.com/video/BV1xK411C7F2/" >Bilibili Video Tutorial for Step_03</a>
 
 <img src="sl_03__Summary.png" alt="isolated" width="1080"/>

04__CodeStyle_MethodGroups_&_US_SeqViewer/README.md

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 [![IMAGE ALT TEXT HERE](https://img.youtube.com/vi/f_gsm0GJ4_8/0.jpg)](https://www.youtube.com/watch?v=f_gsm0GJ4_8&list=PLTuWbByD80TORd1R-J7j7nVQ9fot3C2fK)
 
 
+#### <a href="https://www.youtube.com/watch?v=f_gsm0GJ4_8&list=PLTuWbByD80TORd1R-J7j7nVQ9fot3C2fK">YouTube Video Tutorial for Step_04</a>
+
+#### <a href="https://www.bilibili.com/video/BV1KA411f71N/" >Bilibili Video Tutorial for Step_04</a>
+
 
 <img src="sl_04__Summary.png" alt="isolated" width="1080"/>

README.md

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 [![IMAGE ALT TEXT HERE](https://img.youtube.com/vi/rr0Q9GUuz7E/0.jpg)](https://www.youtube.com/watch?v=rr0Q9GUuz7E&list=PLTuWbByD80TORd1R-J7j7nVQ9fot3C2fK)
 
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 ## <a href="https://github.com/SenonETS/3DSlicerTutorial_ExtensionModuleDevelopment/tree/master/02__Interact_Debug_&_Pipeline" style="text-decoration:none">Step 02: Interact, Debug & Pipeline</a>
 
 <img src="https://github.com/SenonETS/3DSlicerTutorial_ExtensionModuleDevelopment/blob/master/02__Interact_Debug_%26_Pipeline/sl_02__Summary.png" alt="isolated" width="800"/>
 
+#### <a href="https://www.youtube.com/watch?v=Gyd-q4NAI7U&list=PLTuWbByD80TORd1R-J7j7nVQ9fot3C2fK">YouTube Video Tutorial for Step_02</a>
+
+#### <a href="https://www.bilibili.com/video/BV1TM411b7JY/" >Bilibili Video Tutorial for Step_02</a>
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+
+
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+
 
 ## <a href="https://github.com/SenonETS/3DSlicerTutorial_ExtensionModuleDevelopment/tree/master/03__DeveloperFoci_NeatBlanks_&_GUI_HelloWorld" style="text-decoration:none">Step 03: Developer Foci, Neat Blanks & GUI Hello World</a>
 
 <img src="https://github.com/SenonETS/3DSlicerTutorial_ExtensionModuleDevelopment/blob/master/03__DeveloperFoci_NeatBlanks_%26_GUI_HelloWorld/sl_03__Summary.png" alt="isolated" width="800"/>
 
+#### <a href="https://www.youtube.com/watch?v=tOldfUkSecI&list=PLTuWbByD80TORd1R-J7j7nVQ9fot3C2fK" >YouTube Video Tutorial for Step_03</a>
+
+#### <a href="https://www.bilibili.com/video/BV1xK411C7F2/" >Bilibili Video Tutorial for Step_03</a>
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+
+
+
 
 ## <a href="https://github.com/SenonETS/3DSlicerTutorial_ExtensionModuleDevelopment/tree/master/04__CodeStyle_MethodGroups_&_US_SeqViewer" style="text-decoration:none">Step 04: Code Style, Method Groups & US Sequence Viewer</a>
 
 <img src="https://github.com/SenonETS/3DSlicerTutorial_ExtensionModuleDevelopment/blob/master/04__CodeStyle_MethodGroups_%26_US_SeqViewer/sl_04__Summary.png" alt="isolated" width="800"/>
+
+#### <a href="https://www.youtube.com/watch?v=f_gsm0GJ4_8&list=PLTuWbByD80TORd1R-J7j7nVQ9fot3C2fK">YouTube Video Tutorial for Step_04</a>
+
+#### <a href="https://www.bilibili.com/video/BV1KA411f71N/" >Bilibili Video Tutorial for Step_04</a>