Add README.md with detailed usage instructions for driver.sh

- Created README.md to offer comprehensive guidance on using driver.sh.
- Includes instructions for the 'init' and 'delete' commands, script setup, and options for the 'init' command.
- Enhances user understanding and ease of use for the script.

src/aws/README.md

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+# AWS EC2 Management Script
+
+This script is designed to simplify the management of AWS EC2 instances. It provides easy-to-use commands for initializing and deleting EC2 instances.
+
+## Usage
+
+This script supports two main commands: init and delete.
+
+### Command: init
+
+The init command verifies the AWS CLI installation, checks for the existence of an SSH key, and defines functions for importing an SSH key and adding ports in AWS EC2.
+
+```bash
+./driver.sh init [additional options]
+```
+
+Options for init:
+
+- -n [ssh key name]: Specify a name for the SSH key on AWS.
+- -a [balloon name]: Change the SSH key name, instance name, and group name, based on the provided balloon name.
+- -p: Use stored port numbers instead of the default port number.
+
+### Command: delete
+
+The delete command deletes an AWS EC2 instance and its related resources, identified by a given "balloon name". It also handles cleanup tasks such as removing SSH tunnels and deleting security keys.
+
+```bash
+./driver.sh delete [balloon name]
+```
+
+### Help
+
+To view the usage instructions, use the following command:
+
+```bash
+./driver.sh
+```