Added Python and Java solutions for "Smallest Even Multiple"

Author: Kyrylo-Ktl

Java/Smallest Even Multiple.java

@@ -0,0 +1,10 @@
+class Solution {
+
+    /**
+     * Time:   O(1)
+     * Memory: O(1)
+     */
+    public int smallestEvenMultiple(int n) {
+        return n << (n & 1);
+    }
+}

Python/Smallest Even Multiple.py

@@ -0,0 +1,8 @@
+class Solution:
+    """
+    Time:   O(1)
+    Memory: O(1)
+    """
+
+    def smallestEvenMultiple(self, n: int) -> int:
+        return n << (n & 1)