Added README.md file for Game Play Analysis I

Author: MatheusFerGo

1179-game-play-analysis-i/README.md

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+<h2><a href="https://leetcode.com/problems/game-play-analysis-i">Game Play Analysis I</a></h2> <img src='https://img.shields.io/badge/Difficulty-Easy-brightgreen' alt='Difficulty: Easy' /><hr><p>Table: <code>Activity</code></p>
+
+<pre>
++--------------+---------+
+| Column Name  | Type    |
++--------------+---------+
+| player_id    | int     |
+| device_id    | int     |
+| event_date   | date    |
+| games_played | int     |
++--------------+---------+
+(player_id, event_date) is the primary key (combination of columns with unique values) of this table.
+This table shows the activity of players of some games.
+Each row is a record of a player who logged in and played a number of games (possibly 0) before logging out on someday using some device.
+</pre>
+
+<p>&nbsp;</p>
+
+<p>Write a solution to find the <strong>first login date</strong> for each player.</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> 
+Activity table:
++-----------+-----------+------------+--------------+
+| player_id | device_id | event_date | games_played |
++-----------+-----------+------------+--------------+
+| 1         | 2         | 2016-03-01 | 5            |
+| 1         | 2         | 2016-05-02 | 6            |
+| 2         | 3         | 2017-06-25 | 1            |
+| 3         | 1         | 2016-03-02 | 0            |
+| 3         | 4         | 2018-07-03 | 5            |
++-----------+-----------+------------+--------------+
+<strong>Output:</strong> 
++-----------+-------------+
+| player_id | first_login |
++-----------+-------------+
+| 1         | 2016-03-01  |
+| 2         | 2017-06-25  |
+| 3         | 2016-03-02  |
++-----------+-------------+
+</pre>