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added abstract class👩‍💻

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	`1`	`+`
	`2`	`+from abc import ABC, abstractclassmethod # abc - abstract base class & python don't provide any abstract class there is a built-in modules which is in this line`
	`3`	`+`
	`4`	`+`
	`5`	`+class Shape(ABC):`
	`6`	`+ @abstractclassmethod # its decorator`
	`7`	`+ def area(self): pass # empty method`
	`8`	`+`
	`9`	`+ #@abstractclassmethod # abstractmethod is a mthd which must be implemented in subclass`
	`10`	`+ def perimeter(self):pass`
	`11`	`+`
	`12`	`+class Square(Shape):`
	`13`	`+ def __init__(self, side):`
	`14`	`+ self.__side = side`
	`15`	`+ def area(self):`
	`16`	`+ return self.__side * self.__side`
	`17`	`+ def perimeter(self):`
	`18`	`+ return 4 * self.__side`
	`19`	`+`
	`20`	`+`
	`21`	`+square = Square(5) # it can't be intantiated bcoz its abstract class`
	`22`	`+print(square.area())`
	`23`	`+print(square.perimeter())`

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