move approvals version of Java to own folder, provide alternative starting point and documentation

Java-Approvals/src/test/java/com/gildedrose/GildedRoseApprovalTest.java

@@ -0,0 +1,38 @@
+package com.gildedrose;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import org.approvaltests.Approvals;
+import org.approvaltests.reporters.DiffReporter;
+import org.approvaltests.reporters.UseReporter;
+import org.junit.jupiter.api.Test;
+import org.w3c.dom.Text;
+
+@UseReporter(DiffReporter.class)
+public class GildedRoseApprovalTest {
+
+	@Test
+	public void foo() {
+
+        Item[] items = new Item[] { new Item("foo", 0, 0) };
+        GildedRose app = new GildedRose(items);
+        app.updateQuality();
+
+		Approvals.verifyAll("Items", items);
+	}
+
+    @Test
+    public void thirtyDays() {
+
+        ByteArrayOutputStream fakeoutput = new ByteArrayOutputStream();
+        System.setOut(new PrintStream(fakeoutput));
+        System.setIn(new ByteArrayInputStream("a\n".getBytes()));
+
+        Program.main();
+        String output = fakeoutput.toString();
+
+        Approvals.verify(output);
+    }
+}