Added README.md file for Invalid Tweets

Author: Pratik-Khose

1827-invalid-tweets/README.md

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+<h2><a href="https://leetcode.com/problems/invalid-tweets">Invalid Tweets</a></h2> <img src='https://img.shields.io/badge/Difficulty-Easy-brightgreen' alt='Difficulty: Easy' /><hr><p>Table: <code>Tweets</code></p>
+
+<pre>
++----------------+---------+
+| Column Name    | Type    |
++----------------+---------+
+| tweet_id       | int     |
+| content        | varchar |
++----------------+---------+
+tweet_id is the primary key (column with unique values) for this table.
+content consists of characters on an American Keyboard, and no other special characters.
+This table contains all the tweets in a social media app.
+</pre>
+
+<p>&nbsp;</p>
+
+<p>Write a solution to find the IDs of the invalid tweets. The tweet is invalid if the number of characters used in the content of the tweet is <strong>strictly greater</strong> than <code>15</code>.</p>
+
+<p>Return the result table in <strong>any order</strong>.</p>
+
+<p>The result format is in the following example.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> 
+Tweets table:
++----------+-----------------------------------+
+| tweet_id | content                           |
++----------+-----------------------------------+
+| 1        | Let us Code                       |
+| 2        | More than fifteen chars are here! |
++----------+-----------------------------------+
+<strong>Output:</strong> 
++----------+
+| tweet_id |
++----------+
+| 2        |
++----------+
+<strong>Explanation:</strong> 
+Tweet 1 has length = 11. It is a valid tweet.
+Tweet 2 has length = 33. It is an invalid tweet.
+</pre>