update contribution list

Author: abhishek-iitmadras

CONTRIBUTORS.md

@@ -250,4 +250,7 @@ In chronological order:
 
 * Ye Tao <ye.tao@arm.com>
   * [2025-02-03] Optimize SBGEMM kernel on NEOVERSEV1
-  * [2025-02-27] Add sbgemv_n_neon kernel
+  * [2025-02-27] Add sbgemv_n_neon kernel
+
+* Abhishek Kumar <https://github.com/abhishek-iitmadras>
+  * [2025-04-22] Optimise dot kernel for NEOVERSE V1