added file for string pattern and string manipulation learning in python

[HeyySuraj]

this file help people to learn string manipulation in python

this file takes the users input

and makes pattern of string in following pattern which quit interesting to learn

we can give input as much as you want and program can able to makes pattern in following order

[HeyySuraj]

hii @Aman22sharma what type of changes you expecting from this PR

[HeyySuraj]

this pull requests is now updated in #242