Added Where Constraints and Improved Documentation

Added Where Constraints and Improved Documentation

• Added whereNumber, whereSlug, whereAlphaNumeric, and whereAlpha methods to the Route class for defining constraints on route parameters
• Updated documentation to explain the usage of Where constraints in the Route class
• Overall improvement of documentation for better understanding and clarity

add static method to create new instance of Route

add static method to create new instance of Route and improve code

Change type argument of constructor Urlgenerator

1.2.1

 change readme and improvement Urlgenerator class

add more options

1.2.0

refactoring code