rs: add «2540. Minimum Common Value»

Signed-off-by: Matej Focko <mfocko@redhat.com>

rs/minimum-common-value.rs

@@ -0,0 +1,11 @@
+impl Solution {
+    pub fn get_common(xs: Vec<i32>, ys: Vec<i32>) -> i32 {
+        if xs.len() > ys.len() {
+            return Self::get_common(ys, xs);
+        }
+
+        xs.into_iter()
+            .find(|x| ys.binary_search(&x).is_ok())
+            .unwrap_or(-1)
+    }
+}