Added README.md file for Average Salary Excluding the Minimum and Maximum Salary

Author: ErAdnanHabib

1584-average-salary-excluding-the-minimum-and-maximum-salary/README.md

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+<h2><a href="https://leetcode.com/problems/average-salary-excluding-the-minimum-and-maximum-salary">Average Salary Excluding the Minimum and Maximum Salary</a></h2> <img src='https://img.shields.io/badge/Difficulty-Easy-brightgreen' alt='Difficulty: Easy' /><hr><p>You are given an array of <strong>unique</strong> integers <code>salary</code> where <code>salary[i]</code> is the salary of the <code>i<sup>th</sup></code> employee.</p>
+
+<p>Return <em>the average salary of employees excluding the minimum and maximum salary</em>. Answers within <code>10<sup>-5</sup></code> of the actual answer will be accepted.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> salary = [4000,3000,1000,2000]
+<strong>Output:</strong> 2500.00000
+<strong>Explanation:</strong> Minimum salary and maximum salary are 1000 and 4000 respectively.
+Average salary excluding minimum and maximum salary is (2000+3000) / 2 = 2500
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> salary = [1000,2000,3000]
+<strong>Output:</strong> 2000.00000
+<strong>Explanation:</strong> Minimum salary and maximum salary are 1000 and 3000 respectively.
+Average salary excluding minimum and maximum salary is (2000) / 1 = 2000
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+<li><code>3 &lt;= salary.length &lt;= 100</code></li>
+<li><code>1000 &lt;= salary[i] &lt;= 10<sup>6</sup></code></li>
+<li>All the integers of <code>salary</code> are <strong>unique</strong>.</li>
+</ul>