Project setup

README.md

@@ -4,7 +4,15 @@ An implementation of the Romulus-M cryptography specification.
 
 ## Build
 
-_Build instructions coming soon._
+To build the Romulus-JS library, first clone this repository.
+
+Run the following commands from the root of the repository:
+```bash
+$ npm install
+$ npm run build
+```
+
+The build output will be saved to the `lib` directory.
 
 ### Visual Studio Code