Add GCD implementation (TheAlgorithms#371)

Author: JoaoMLima

Maths/gcd.py

@@ -0,0 +1,12 @@
+def gcd(a, b):  
+    if a == 0 : 
+        return b  
+      
+    return gcd(b%a, a)
+
+def main():
+	print(gcd(3, 6))
+
+
+if __name__ == '__main__':
+	main()