Add deployment notes

deployment_notes.md

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+# Working Deployment Notes
+
+Steps for deploying a basic Rails project using AWS Fargate
+
+<ul>
+  <li><a href='#dockerize-the-project'>Dockerize the project</a></li>
+  <li><a href='#create-an-ecr-repo'>Create an Amazon ECR Repository</a></li>
+  <li><a href='#push-the-image'>Push the Docker image to Amazon ECR</a></li>
+  <li><a href='#create-task-definition'>Create a Task Definition</a></li>
+  <li><a href='#create-a-cluster'>Create a Cluster</a></li>
+  <li><a href='#create-a-service'>Create a Service</a></li>
+  <li><a href='#create-a-task'>Create a Task</a></li>
+<ul>
+
+<a id='dockerize-the-project'></a>
+## Dockerize the project
+
+Update the (Dockerfile)[https://github.com/unboxed/retrofit/blob/main/Dockerfile].
+
+Run
+```
+docker build . -t retrofit
+docker run -p 3000:3000 retrofit
+```
+
+Check it's up and running at `http://localhost:3000`.
+
+<a id='create-an-ecr-repo'></a>
+## Create an Amazon ECR Repository
+
+In the AWS console go to [ECR Private Repositories](https://console.aws.amazon.com/ecr/private-registry/repositories), click `Create Repository` and create a new private repository. 
+
+(See [AWS documentation](https://docs.aws.amazon.com/AmazonECR/latest/userguide/repository-create.html).)
+
+<a id='push-the-image'></a>
+## Push the Docker image to Amazon ECR
+
+### Authenticate your Docker client to the ECR registry:
+
+`aws ecr get-login-password --region <region> | docker login --username AWS --password-stdin <aws_account_id>.dkr.ecr.<region>.amazonaws.com`
+
+### Tag the Docker image with the ECR repository URI:
+
+Run `docker images` to get the image id.
+
+Get the ECR repository URI from [the AWC ECR console](https://console.aws.amazon.com/ecr/private-registry/repositories).
+
+Tag the docker image: 
+
+`docker tag <image_id> <repository_uri>:<optional_tag>`
+
+### Push the Docker image:
+
+`docker push <repository_uri>:<optional_tag>`
+
+(See [AWS documentation](https://docs.aws.amazon.com/AmazonECR/latest/userguide/docker-push-ecr-image.html).)
+
+<a id='create-task-definition'></a>
+## Create an ECS Task Definition
+
+- In the AWS Console go to [ECS Task Definitions](https://console.aws.amazon.com/ecs/v2/task-definitions) and click 'Create a new task definition'.
+- Under 'Launch Type' check 'AWS Fargate'.
+- Set desired CPU and Memory.
+- Under 'Container', enter a container name and your ECR repository URI.
+- Click 'Create'
+
+<a id='create-a-cluster'></a>
+## Create a Cluster
+
+- In the AWS Console go to [ECS Clusters](https://console.aws.amazon.com/ecs/v2/clusters) and click 'Create cluster'.
+- Under 'Infrastructure' check 'AWS Fargate (serverless)'
+- Click 'Create'
+
+<a id='create-a-service'></a>
+## Create a Service
+
+In [ECS Clusters](https://console.aws.amazon.com/ecs/v2/clusters) click on your cluster name.
+
+- In the 'Services' tab click 'Create'.
+- Under 'Networking' select default VPC.
+- Under 'Subnets' select one of the default subnets.
+- Click 'Create'. 
+
+<a id='create-a-service'></a>
+## Create an Task
+
+- Go back to your cluctser ([ECS Clusters](https://console.aws.amazon.com/ecs/v2/clusters) and click on your cluster name.)
+- In the 'Tasks' tab click 'Run new task'.
+
+TBC!
+
+
+### Glossary
+
+- <strong>Cluster</strong> is a logical way to group services and task definition.
+
+- <strong>Services</strong> are used to run load balancers in front of group of tasks. This is also where you specify how many instances of task should be running.
+
+- <strong>Tasks</strong> are the running instances of a task definition.
+
+
+## Resources
+
+[Useful blog post on deploying with Fargate](https://allenchun.medium.com/deploy-rails-app-image-in-serverless-way-using-aws-fargate-aa79369e9196)
+