Add bit manipulation questions (#72)

algorithms/bit-manipulation.md

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+Bit Manipulation
+==
+
+- How do you verify if an interger is a power of 2?
+- Wirte a program to print the binary representation of an integer.
+- Write a program to print out the number of 1 bits in a given integer.
+- Write a program to determine the largest possible integer using the same number of 1 bits in a given number.