feat: add demo link

[hanjituan]

Recently, I have been using some features of the library, but there are not many examples on the official website that directly or indirectly meet my needs. 
So, I started reading documentation and researching code (this is not a bad habit, on the contrary, I think it is a good habit) But I am well aware of the importance of examples, and I have restored some of the requirements in development with simple code And share it in the form of a codepen And I can guarantee that I will regularly check the availability of network image addresses There will be opportunities to update other usage scenarios, either on CodePen or in other articles I think this is a great library, and I believe adding more use cases will make more people fall in love with it in the future