adding an example for MySQL

Readme.rst

@@ -1048,6 +1048,40 @@ This `my_reader.py` should implement a class inherited from AbstractReaderClass
             return test_data  # return the list of TestCaseData to DataDriver
 
 
+To facilitate dynamic data-driven testing using data from a database, 
+it also can integrate a custom reader for Databases with the DataDriver library. 
+Below is a simple example with `MySQL` to set up and utilize this custom reader within your testing environment.
+
+.. code :: python
+
+    from DataDriver.AbstractReaderClass import AbstractReaderClass
+    from DataDriver.ReaderConfig import TestCaseData
+    import mysql.connector
+
+    class MySQLDatabaseReader(AbstractReaderClass):
+        def __init__(self, reader_config):
+            super().__init__(reader_config)
+            self.db_config = {
+                'host': self.kwargs.get('host', 'localhost'),
+                'user': self.kwargs.get('user', 'your_username'),
+                'password': self.kwargs.get('password', 'your_password'),
+                'database': self.kwargs.get('database', 'test_db')
+            }
+
+        def get_data_from_source(self):
+            test_data = []
+            connection = mysql.connector.connect(**self.db_config)
+            cursor = connection.cursor()
+            cursor.execute("SELECT id, value1, value2, tag FROM test_cases")  # Adjust this query for your table structure
+
+            for row in cursor.fetchall():
+                args = {'${var_1}': str(row[1]), '${var_2}': str(row[2])}
+                test_data.append(TestCaseData(f'test {row[0]}', args, [row[3]]))
+
+            cursor.close()
+            connection.close()
+            return test_data
+
 See other readers as example.