added a readme with a list of quickstart steps.

Author: DevoKun

example/README.md

@@ -0,0 +1,66 @@
+Example for creating an custom Lambda Layer to run PHP 7
+========================================================
+
+## Quickstart
+
+```bash
+
+## Build the docker image
+
+docker build -t lambda-php .
+
+## Test locally using Docker
+## The bootstrap script will be the entrypoint,
+##   which will then run the specified lambda function,
+##   and pass the input data to the lambda function.
+
+docker run lambda-php hello '{"name": "World"}'
+
+## Install img2lambda
+
+wget -O /usr/local/bin/img2lambda \
+     https://github.com/awslabs/aws-lambda-container-image-converter/releases/download/0.3.0/linux-amd64-img2lambda
+chmod 0755 /usr/local/bin/img2lambda
+
+## Deploy lambda layer
+
+img2lambda -i lambda-php:latest -r us-east-1 -n lambda-php
+
+## Deploy Lambda functions: hello and goodbye
+## img2lambda creates `output/layers.yaml` which will be combined with `template.yaml` to create `template-with-layers.yaml`
+
+export AWS_REGION="us-east-1"
+export MY_LAMBDA_LAYER_BUCKET="devokun-lambda-php"
+
+
+sed -i 's/^- /      - /' ../output/layers.yaml && \
+sed -e "/LAYERS_PLACEHOLDER/r ../output/layers.yaml" \
+    -e "s///" template.yaml > template-with-layers.yaml
+
+
+## Install AWS CLI
+
+pip3 install aws-cli
+
+## Create S3 bucket for storing Lambda Functions
+
+aws s3 mb s3://${MY_LAMBDA_LAYER_BUCKET}
+
+## Install SAM CLI
+
+pip3 install aws-sam-cli
+
+## Deploy Lambda functions using SAM
+
+sam package --template-file template-with-layers.yaml \
+            --output-template-file packaged.yaml \
+            --region ${AWS_REGION} \
+            --s3-bucket ${MY_LAMBDA_LAYER_BUCKET}
+
+sam deploy --template-file packaged.yaml \
+           --capabilities CAPABILITY_IAM  \
+           --region ${AWS_REGION} \
+           --stack-name img2lambda-php-example
+
+```
+