Add batch of 7 tutorials: ECS EC2, EBS volumes, ELB, ECR, Step Functions, ECS Service Connect, ECS Fargate

Author: anumohap

tuts/018-ecs-ec2/README.md

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+# Amazon Elastic Container Service EC2 getting started
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+This tutorial demonstrates how to get started with Amazon Elastic Container Service (Amazon ECS) using EC2 instances as the compute platform. You'll learn how to create an ECS cluster, define a task definition, and run containerized applications on EC2 instances within your ECS cluster.
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+You can either run the automated shell script (`ecs-ec2-getting-started.sh`) to quickly set up the entire environment, or follow the step-by-step instructions in the tutorial (`ecs-ec2-getting-started.md`) to understand each component and manually configure your ECS environment.