kt: add «2914. Minimum Number of Changes to Make Binary String Beautiful»

URL:	https://leetcode.com/problems/minimum-number-of-changes-to-make-binary-string-beautiful/
Signed-off-by: Matej Focko <me@mfocko.xyz>

kt/minimum-number-of-changes-to-make-binary-string-beautiful.kt

@@ -0,0 +1,6 @@
+class Solution {
+    fun minChanges(s: String): Int =
+        s.chunked(2).map {
+            if (it[0] != it[1]) 1 else 0
+        }.sum()
+}