Add scripts to ease setting of variables and publishing docker

[gibbardsteve]

Added two scripts and updated the README.

set_aws_env.sh - When the user has an AWS credentials file at ~/.aws/credentials that is populated with multiple sets of credentials using the profile nomenclature below. Then this script can be used to set appropriate environment variables in the terminal by specifying profile and environment

[default]
aws_access_key_id = default_accesskey
aws_secret_access_key = default_secretkey
[account_ecr_user]
aws_access_key_id = account_ecr_user_accesskey
aws_secret_access_key = account_ecr_user_secretkey
...

publish_container.sh - When the user has a profile setup in their AWS credential file, this script can be used to build, login and publish an image to ECR. This script requires the user to specify the AWS profile, AWS account number, environment and version that you require the container to be tagged with (e.g v0.0.1).

README.md - Updated with above details.

[delterr]

Everything looks good