Filled out the docs

Author: swartzrock

README.md

@@ -1,4 +1,44 @@
 # graalvm-scala-lambda
 
+
 A Hello, World app for AWS Lambda. Written in Scala, compiled with the GraalVM and executed with the AWS Lambda Custom Runtime.
 
+
+This is the example project for my [AWS Lambda, Scala, and GraalVM](https://www.bks2.com/2019/05/17/scala-lambda-functions-with-graalvm/)
+blog post.
+
+
+## Requirements
+
+This project uses SBT for building Scala projects, Docker for further compiling the Scala code to a linux executable, 
+and Amazon's SAM CLI app for testing/packaging/deploying AWS Lambda functions. You'll need all of the following to run the project:
+
+1. [SBT](https://www.scala-sbt.org/) 
+    * The Scala Build Tool
+1. [SAM CLI](https://aws.amazon.com/serverless/sam/) 
+    * The AWS Serverless Application Model app (a wrapper around AWS CloudFormation and the CLI)
+1. [AWS CLI](https://aws.amazon.com/cli/) 
+    * The popular CLI for accessing the AWS API
+1. [Docker](https://www.docker.com/) 
+    * Required by SAM for local testing of Lambda functions
+1. curl 
+    * The performant web client used to test the running Lambda functions
+1. An AWS account and valid credentials
+    * Allows the SAM tool to deploy your function to API Gateway / AWS Lambda
+
+## Building and Running The Function Locally
+
+Open your terminal to the project directory and run the following to build and run the function locally:
+
+    $ ./build.sh && sam local start-api
+
+Open a separate terminal in the same directory and test out the function with `curl`:
+
+    $ curl http://127.0.0.1:3000/hello/developer
+    Hello, developer
+
+The `Hello, $name` response from the function appears, with the name taken from the path parameter following the `hello/` segment. 
+
+See the [post](https://www.bks2.com/2019/05/17/scala-lambda-functions-with-graalvm/) for the remaining instructions on uploading and deploying your function
+to AWS Lambda.
+