Add README.md and aws helper shell script

README.md

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+# AWS CLI in Docker
+
+Containerized AWS CLI on Debian stable to avoid requiring the aws cli to be installed locally.
+
+Includes the SSM Session Manager plugin to allow for remote session access to EC2 instances.
+
+## Build
+
+```
+docker build -t jtbouse/aws-cli .
+```
+
+Automated build on Docker Hub
+
+[![DockerHub Badge](http://dockeri.co/image/jtbouse/aws-cli)](https://hub.docker.com/r/jtbouse/aws-cli/)
+
+## Usage
+
+Configure:
+
+```
+$ aws configure
+AWS Access Key ID [None]: accesskey
+AWS Secret Access Key [None]: secretkey
+Default region name [None]: us-east-1
+Default output format [None]:
+```
+
+Upload file to S3:
+
+```
+$ aws s3 cp ../sample-file.yaml s3://somebucket/example/
+```
+
+Caveat: Because `aws` mounts the current directory as `/project`, paths to local files must be relative to the current directory.
+
+Start SSM Session:
+
+```
+$ aws ssm start-session --target instance-id-to-connect
+```
+
+## Install
+
+To use `aws` as a drop-in replacement for calls to the aws-cli, use one of the following methods:
+
+Add an alias to your shell:
+
+```
+alias aws='docker run --rm -t $(tty &>/dev/null && echo "-i") -v ${HOME}/.aws:/root/.aws -v "$(pwd):/project" jtbouse/aws-cli'
+```
+
+Or drop it into your path named `aws`:
+
+```
+$ curl -o /usr/local/bin/aws https://raw.githubusercontent.com/jtbouse/aws-cli/master/aws
+$ chmod a+x /usr/local/bin/aws
+```
+
+## Maintenance
+
+- The Docker image build & publish is automated by DockerHub for master commits and tags.
+- The awscli and s3cmd packages have handcoded versions in the Dockerfile that need to be bumped manually.
+
+## References
+
+AWS CLI Docs: https://aws.amazon.com/documentation/cli/

aws

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+#!/usr/bin/env bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+trap - INT TERM
+
+docker run --rm \
+	-t $(tty &>/dev/null && echo "-i") \
+	-v ${HOME}/.aws:/root/.aws \
+	-v $(pwd):/project \
+	jtbouse/aws-cli \
+	$@