Adding README

Author: fishcharlie

README.md

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+# aws-lambda-custom-node-runtime [![NPM version](https://badge.fury.io/js/aws-lambda-custom-node-runtime.svg)](http://badge.fury.io/js/aws-lambda-custom-node-runtime)
+
+aws-lambda-custom-node-runtime is an easy to use CLI tool that lets you create a custom Node.js runtime for any Node.js version.
+
+## Install
+
+```
+npm install -g aws-lambda-custom-node-runtime
+```
+
+## Usage
+
+```
+aws-lambda-custom-node-runtime <node_version>
+```
+
+**Commands:**
+
+- `node_version` (Node.js version to use (ex. 11.3.0))
+
+**Example command:**
+
+```
+aws-lambda-custom-node-runtime 11.3.0
+```