add solution in rust: 1523. Count Odd Numbers in an Interval Range

Signed-off-by: rajput-hemant <rajput.hemant2001@gmail.com>

Author: rajput-hemant

src/1501-1600/1523. Count Odd Numbers in an Interval Range/README.md renamed to src/1501-1600/1523 - Count Odd Numbers in an Interval Range/README.md

@@ -0,0 +1,6 @@
+impl Solution {
+    pub fn count_odds(low: i32, high: i32) -> i32 {
+        // ((high + 1) / 2) - (low / 2)
+        ((high + 1) >> 1) - (low >> 1) // same as above
+    }
+}