Create very basic README

This will be expanded later to better document the package

Author: nibble-4bits

README.md

@@ -0,0 +1,7 @@
+# AWS Local Step Functions
+
+A Node.js implementation of the [Amazon States Language specification](https://states-language.net/spec.html).
+
+## License
+
+[MIT](https://github.com/nibble-4bits/aws-local-stepfunctions/blob/develop/LICENSE)