uloapi: set up basic routing

experimental/uloapi/src/main/java/info/mathhub/uloapi/Main.java

@@ -3,7 +3,10 @@ package info.mathhub.uloapi;
 import static spark.Spark.*;
 
 public class Main {
+    private Main() {};
+
     public static void main(String[] args) {
-        get("/hello", (req, res) -> "Hello World");
+        get("/", Routes.index);
+        get("/favicon.ico", Routes.createError(404));
     }
 }

experimental/uloapi/src/main/java/info/mathhub/uloapi/Routes.java

+package info.mathhub.uloapi;
+
+import spark.*;
+
+/**
+ * This class contains all routes of our application.
+ */
+public class Routes {
+    private Routes() {};
+
+    public static final Route index = (Request request, Response response) -> {
+        return "<h1>Index /</h1>";
+    };
+
+    public static Route createError(int status) {
+       return (Request request, Response response) -> {
+           response.status(status);
+           return String.format("Error %d", status);
+       };
+    }
+}