doc: Add manual documentation.

Author: huyhoangpham

README.md

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+## Objectives
+To design and construct an Amazon Virtual Private Cloud (VPC) architecture that includes an EC2 instance within a public subnet and a database instance within a private subnet
+
+Problem Statement and Motivation
+
+Real-Time Scenario:
+
+James, a systems engineer at a startup company, is tasked with developing a web application with a secure, robust, and scalable backend database.
+
+The company plans to utilize AWS RDS for the database, while the application will be deployed on an EC2 instance.
+
+James must ensure a secure VPC setup where the EC2 instance resides in the public subnet and the RDS DB instance in a private subnet.
+
+Problem Statement and Motivation
+
+Expected Solution:
+
+As a cloud architect, your objective is to assist James in developing an AWS VPC that hosts both an EC2 instance and a database instance.
+
+The EC2 instance, serving the web application, should be placed in a public subnet, while the DB instance should be secured in a private subnet.
+
+You are expected to provide step-by-step instructions for creating and configuring these AWS resources, ensuring system security, reliability, and accessibility.
+
+
+## Solution
+![Image](https://github.com/huyphamch/terraform-aws-create-web-rds/blob/master/manual/Project1.drawio.png)
+<br />My solution is to create a VPC with two Amazon EC2 instances in different availability zones and separate public subnets in a region. 
+Then the RDS database supporting multi availability zones is created in a private subnet to only allow data access from the EC2 instances within the security group.
+Http requests a forwarded from the Internet Gateway to the EC2 instances which can access the data from the RDS database and send the response via Internet Gateway to the client.
+
+<br />The manual steps to achieve the same result using the AWS management console are documented [here](https://github.com/huyphamch/terraform-aws-create-web-rds/blob/master/manual/Creating a VPC with Database and EC2 Instances.pdf)