Add a couple of AWS exercises and questions

MORE! :)

exercises/aws/solutions/mysql_db.md

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+## AWS Databases - MySQL DB
+
+### Objectives
+
+1. Create a MySQL database with the following properties
+  * Instance type: db.t2.micro
+  * gp2 storage
+  * Storage Auto scaling should be enabled and threshold should be set to 500 GiB
+  * Public access should be enabled
+  * Port should be set to 3306
+  * DB name: 'db'
+  * Backup retention: 10 days
+
+2. Create read replica for the database you've created
+
+### Solution
+
+#### Console
+
+1. Go to RDS service
+2. Click on "Databases" in the left side menu and click on the "Create database" button
+3. Choose "standard create"
+4. Choose "MySQL" and the recommended version
+5. Choose "Production" template
+6. Specify DB instance identifier
+7. Specify Credentials (master username and password)
+8. Choose DB instance type: Burstable classes, db.t2.micro
+9. Choose "gp2" as storage
+10. Enable storage autoscalling: maximum storage threshold of 500 GiB
+11. Choose "Do not create a standby instance"
+12. Choose a default VPC and subnet
+12. Check "Yes" for public access
+13. Choose "No preference" for AZ
+14. Database port should be 3306
+15. For authentication, choose "Password and IAM database authentication"
+16. Set initial database name as "db"
+17. Increase backup retention period to 10 days
+18. Click on "Create database" button
+
+1. Go to the database under "Databases" in the left side menu
+2. Click on "Actions" -> Create read replica
+3. Click on "Create read replica"