Update and rename leetcode_184.sql to leetcode_184.md

Author: developer-Akhil

leetcode_184.md

@@ -0,0 +1,12 @@
+# Description
+184. Department Highest Salary
+
+https://leetcode.com/problems/department-highest-salary/
+
+# Solution
+```
+select dept.name as department, emp.name as employee,  salary  from leetcode.employee_184 emp 
+  join leetcode.department_184 dept on dept.id = emp.departmentId 
+  where  (emp.departmentId,emp.salary) in (select departmentId,  max(salary)  
+  from leetcode.employee_184 group by departmentId);
+```