Update README.md

Author: nb312

README.md

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 ## Just for learning
 ### :heart: Star :heart: the repo to support the project or :smile:[Follow Me](https://github.com/nb312).Thanks!
+Facebook Page | Facebook Group | QQ Group | Developer |
+--- | --- | --- | ---
+[Flutter Open ](https://www.facebook.com/flutteropen) | [Flutter Open](https://www.facebook.com/groups/948618338674126/) |  963828159 |[NieBin](https://github.com/nb312)
 ### This project contains contents are following:  
 Scrollview |  Sliver | common layout | Other | 
 --- | --- | --- |---