How can I include examples in library?
You need to create a folder called "examples" in your library folder. Within there, each in its own folder, you place your examples.

For example:

MyLib/
MyLib/MyLib.h
MyLib/MyLib.cpp
MyLib/examples/
MyLib/examples/Example1/
MyLib/examples/Example1/Example1.ino
MyLib/examples/Example2/
MyLib/examples/Example2/Example2.ino


Be sure to name the example's folder the same as the name of the example.