chore: Setup JUnit (#7)

* test: Initial JUnit setup

* chore: Fix module name in module-info

* chore: Delete module-info in test directory

* chore: Update workflow name

.github/workflows/gradle-build.yml

@@ -1,4 +1,4 @@
-name: Build project
+name: Build & test project
 
 on:
   push:

src/main/java/module-info.java

@@ -1,4 +1,4 @@
-module io.rpg.rpg {
+module io.rpg {
   requires javafx.controls;
   requires javafx.fxml;
   requires javafx.web;

src/test/java/io/rpg/MockTest.java

@@ -0,0 +1,9 @@
+package io.rpg;
+
+import org.junit.jupiter.api.Test;
+
+public class MockTest {
+  @Test
+  void mockTest() {
+  }
+}