Add docs

docs/steps.md

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+1. Check whether .zip file has been uploaded to S3
+2. If not uploaded, upload .zip file to S3, and then create an application version for the specified application with the .zip file.
+3. Check the environment status (check whether the environment has been created)
+4. If environment already exists, then check whether DNS exists, then create environment, then wait for the environment status is not 'Launching'
+5. If environment does not exist, then update environment to use new application version, then wait for the environment status is not 'Updating'
+6. Wait until environment status is Healthy
+7. return deployment info