Add a java version of the dev app. (#218)

src/dev/java/edu/wpi/first/ntcore/DevMain.java

@@ -0,0 +1,12 @@
+package edu.wpi.first.ntcore;
+
+import edu.wpi.first.wpilibj.networktables.NetworkTablesJNI;
+import edu.wpi.first.wpiutil.RuntimeDetector;
+
+public class DevMain {
+    public static void main(String[] args) {
+        System.out.println("Hello World!");
+        System.out.println(RuntimeDetector.getPlatformPath());
+        NetworkTablesJNI.flush();
+    }
+}