Add initial instructions for running the project

README.md

+**Setup**:
+
+Make sure java 17 is installed.
+Make sure that Maven 3.8.3 is installed on your computer with `mvn --version`. If it is not, follow the instructions here: https://maven.apache.org/install.html.
+
+Test that things are up and running and can work on your machine. Run mvn package in the kg-shape-project directory, and you should see a build success message.
+Then from the same directory, in the command line run:
+
+`java -cp target/kg-shape-project-1.0-SNAPSHOT.jar com.kgshape.app.App`
+
+You should see a Hello World message.