add logo and update gcd and make lcm

snippets/lcm.md

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+### lcm 
+
+Returns the least common multiple of two or more numbers.
+
+Use the `greatest common divisor (GCD)` formula and the fact that `lcm(x,y) = x * y / gcd(x,y)` to determine the least common multiple. The GCD formula uses recursion.
+
+```python 
+from functools import reduce
+
+
+def spread(arg):
+    ret = []
+    for i in arg:
+        if isinstance(i, list):
+            ret.extend(i)
+        else:
+            ret.append(i)
+    return ret
+
+
+def lcm(*args):
+    numbers = []
+    numbers.extend(spread(list(args)))
+
+    def _gcd(x, y):
+        return x if not y else gcd(y, x % y)
+
+    def _lcm(x, y):
+        return x * y / _gcd(x, y)
+
+    return reduce((lambda x, y: _lcm(x, y)), numbers)
+
+```
+
+
+
+``` python
+lcm(12, 7); # 84
+lcm([1, 3, 4], 5); # 60
+```