added circular queve game in python

[roshankraveendrababu]

#17
the code for implementing circular queve game was added in python along with its examples and constraints in a seperate folder.
the intuition behind the code is :
A variable idx is initialized to 0
The loop continues while there are more than one friend left in the circle
the formula (idx + k - 1) % len(friends) is used to eliminate friends
The friend at the computed idx is eliminated using pop() and the process is repeated
when only one friend remains, that friend is the winner and the function returns this friend

the code also has algorithm and comment for each line for easy understanding ..

[Saket6198]

@roshankraveendrababu only commit the required file for the aforementioned issue, dont add solutions for other issues in your PR else it will be rejected.