Added initial readme

README.md

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+# Overview
+
+`mon-api` is a RESTful API server that is designed with a layered architecture [layered architecture](http://en.wikipedia.org/wiki/Multilayered_architecture).
+
+## Usage
+
+```
+mvn package
+java -jar target/mon-api.jar server config-file.yml
+```
+
+## Design Overview
+
+### Architectural layers
+
+* Resource
+  * Serves as the entrypoint into the service. 
+  * Responsible for handling web service requests, and performing structural request validation.
+* Application
+  * Responsible for providing application level implementations for specific use cases.
+* Domain
+  * Contains the technology agnostic core domain model and domain service definitions.
+  * Responsible for defining state transitions.
+* Infrastructure
+  * Contains technology specific implementations of domain services.