Added DEMO Sequence Step

DEMO.md

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+# DEMO DevOpsCorner Terraform Infra
+
+## Deploy Container Image CI/CD
+
+- Clone Repository [DevOpsCorner Container](https://github.com/devopscorner/devopscorner-container)
+- Creating Dockerfile for Container Image CI/CD
+- Creating Pipeline for Building Container Image CI/CD (`_infra/buildspec.yml`)
+- Setup Varible Environment / Using Config Secret with AWS Parameter Store
+- Running Pipeline with AWS CodePipeline & AWS CodeBuild
+- Register Container Image CI/CD to Amazon ECR (Container Registry)
+
+## Provisioning EKS Inside Container
+
+- Clone This Repository ([Terraform Infra](https://github.com/devopscorner/terraform-infra))
+- Creating Dockerfile for Container Terraform Infra
+- Creating Pipeline for Build Container Image Terraform Infra (`_infra/buildspec-eks.yml`)
+- Setup Varible Environment / Using Config Secret with AWS Parameter Store
+- Running Pipeline Build Container Image Terraform Infra
+- Register Container Image Terraform Infra to Amazon ECR
+- Creating Pipeline for Terraform Plan (`buildspec-terraform-eks-plan.yml`), Terraform Apply (`_infra/buildspec-terraform-eks-apply.yml`) & Terraform Destroy (`_infra/buildspec-terraform-eks-destroy.yml`)
+- Create Manual Approval Pipeline for Apply
+- Create Manual Approval Pipeline for Destroy
+- Running Pipeline for Terraform Plan
+- Running Pipeline for Terraform Apply (Auto Approved), after trigger Manual Approval Apply
+- Running Pipeline for Terraform Destroy (Auto Approved), after trigger Manual Approval Destroy