adds README

Author: svnldwg

README.md

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+# Lambda PHP Skeleton
+
+Skeleton to kick off projects using AWS Lambda functions with PHP. Because AWS Lambda does not natively support PHP, the Bref Framework is used which provides a layer to execute PHP code on AWS Lambda.
+
+## Getting Started
+
+These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.
+
+### Prerequisites
+
+#### AWS credentials
+
+* Create AWS keys: https://bref.sh/docs/installation/aws-keys.html
+* Store AWS key and secret in env vars. You may include them in your `.bash_profile` / `.zshrc`:
+```
+export AWS_ACCESS_KEY_ID=YOUR_AWS_KEY
+export AWS_SECRET_ACCESS_KEY=YOUR_AWS_SECRET
+export AWS_DEFAULT_REGION=eu-central-1
+```
+
+#### Local serverless installation
+Most commands run in docker images. The bref console commands can not be executed in docker though, but must be executed locally. To use these commands, PHP >=7.2 and serverless must be installed.
+
+See installation instructions for serverless: https://bref.sh/docs/installation.html#serverless
+
+## Running the tests
+
+TODO: Explain how to run the automated tests for this system
+
+## Deployment
+
+Deployment to AWS can be done by executing
+
+```
+make serverless-deploy
+```