Hello Ang Guo,
If you wish to add your own application, you would need to port to Yocto. The best way to do this would be creating a new Yocto layer and your own recipe that will fetch, compile and install your application.
This is no trivial task, but there are a few useful resources on the Yocto documentation.
For more details on how to create a new Layer and how layers work in Yocto please look at the following section of the Yocto Project Manual:
https://www.yoctoproject.org/docs/2.4/mega-manual/mega-manual.html#understanding-and-creating-layers
As for how recipes work and creating a new recipe please look at the following section of the same document:
https://www.yoctoproject.org/docs/2.4/mega-manual/mega-manual.html#new-recipe-writing-a-new-recipe
I hope this helps!
Regards,
