Added task 1729.

Author: javadev

src/main/java/g1701_1800/s1729_find_followers_count/readme.md

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+1729\. Find Followers Count
+
+Easy
+
+SQL Schema
+
+Table: `Followers`
+
+    +-------------+------+
+    | Column Name | Type |
+    +-------------+------+
+    | user_id     | int  |
+    | follower_id | int  |
+    +-------------+------+
+    (user_id, follower_id) is the primary key for this table.
+    This table contains the IDs of a user and a follower in a social media app where the follower follows the user.
+
+Write an SQL query that will, for each user, return the number of followers.
+
+Return the result table ordered by `user_id`.
+
+The query result format is in the following example.
+
+**Example 1:**
+
+**Input:**
+
+    Followers table:
+    +---------+-------------+
+    | user_id | follower_id |
+    +---------+-------------+
+    | 0       | 1           |
+    | 1       | 0           |
+    | 2       | 0           |
+    | 2       | 1           |
+    +---------+-------------+
+
+**Output:**
+
+    +---------+----------------+
+    | user_id | followers_count|
+    +---------+----------------+
+    | 0       | 1              |
+    | 1       | 1              |
+    | 2       | 2              |
+    +---------+----------------+
+
+**Explanation:**
+
+The followers of 0 are {1}
+
+The followers of 1 are {0}
+
+The followers of 2 are {0,1} 

src/main/java/g1701_1800/s1729_find_followers_count/script.sql

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+# Write your MySQL query statement below
+# #Easy #Database #SQL_I_Day_7_Function #2022_04_30_Time_456_ms_(88.39%)_Space_0B_(100.00%)
+select user_id, count(follower_id) as followers_count
+from followers
+group by user_id
+order by user_id