Create README.md

Author: netromdk

README.md

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+# math
+Math library written in C++.
+
+It implements mathematical constructs, such as
+* Greatest Common Divisor
+* Least Common Multiple
+* Logarithms (log 10, log 2, ln)
+* Modulus
+* Exponentiation
+* Euler's totient/phi function
+* Sieve of Eratosthenes
+* Carmichael number test
+* Pollard Rho
+* Pollard P-1
+* B-Smoothness test
+* Square-free test