Introduced strategy design pattern

Added Strategies:
if true and if false
Replace String literals
Remove if blocks which do not have else.
Modify Comparision Statement - changing <= to < and changing >= to >
Duplicating statements
Added plus to minus and minus to plus mutaiton strategy

Classifying build failures for mutant as unexpected error - Skipping test run for mutant with compilation failure
Added logger messages instead of print
Randomized the mutation test order
Try new strategy on failure to mutate on a file
Updated Readme - Adding mutation strategy and mutation test execution flow