Adding example to getting-started section 🔼

[tungbq]

Building the content in https://github.com/tungbq/aws-lab-with-terraform/tree/main/getting-started

Sub-Tasks:

• [getting-started] Write an example to execute local command #118
• [Getting started] Add local-exec multi command example #124
• [getting-started] Write an example to create a simple S3 bucket  #97
• [getting-started] Add an example to create a basic EC2 instance with simple effort #126
• [getting-started] Add an example to create an EC2 instance with user-data script #127
• [getting-started] Add an example to create a basic Load Balancer #128
• [getting-started] Add an example to create a basic lamda function with simple effort #129
• ...