ReadMe updates for contributors (#34)

* Fix typo in private key generation

* update development notes

README.md

@@ -1,3 +1,44 @@
 # Morphir JVM binding
 
-This repo contains tools to work with the Morphir IR on the@ JVM. It will include data models for the IR, JSON serialization and developer tooling.
+This repo contains tools to work with the Morphir IR on the JVM. It will include data models for the IR, JSON serialization and developer tooling.
+
+## How to build and test
+
+Morphir-jvm use [mill]("http://www.lihaoyi.com/mill/) as its build tool.
+
+### IntelliJ Setup
+
+If you are using IntelliJ IDEA to edit morphir-jvm's Scala code, you can create the
+IntelliJ project files via:
+
+```bash
+./mill mill.scalalib.GenIdea/idea
+```
+
+### BSP Setup
+
+If you are using Visual Studio Code, IntelliJ, or any of the Editors which support BSP you can also generate BSP config files via:
+
+```bash
+./mill mill.contrib.Bloop/install
+```
+
+### Run Tests
+
+```bash
+./mill __.test
+```
+
+or in watch mode:
+
+```bash
+./mill -w __.test
+```
+
+### Formatting Code
+
+Code needs to be formatted according to `scalafmt` rules. To run `scalafmt` on all the source code using:
+
+```bash
+./mill mill.scalalib.scalafmt.ScalafmtModule/reformatAll __.sources
+```