Adding Methods to Database Service

[Kishan-Thumar]

Sub Task to the Main Issue #5

Adding the method to read all records, and write all records ( via .csv file ) in the Dynamo DB. This particular step will involve the following task.

• Configuring the table in the cloudformation file to create a table on the DynamoDB.
• Creating a method to read all the records present in the Database.
• Creating a method to write all records written in a .csv file into the Database.

[Kishan-Thumar]

@scp756-221/data-miners here's the commit link, please review the updates