Started the downloading ability of the file

src/main/java/ic/doc/web/MarkdownResultPage.java

+package ic.doc.web;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import javax.servlet.http.HttpServletResponse;
+import org.eclipse.jetty.server.HttpOutput;
+
+public class MarkdownResultPage implements Page {
+
+  private final String query;
+  private final String answer;
+
+  public MarkdownResultPage(String query, String answer) {
+    this.query = query;
+    this.answer = answer;
+  }
+
+  @Override
+  public void writeTo(HttpServletResponse resp) throws IOException {
+    File markdown = new File("result.md");
+    // Header
+    FileWriter writer = new FileWriter("result.md");
+    writer.write(query + "\n");
+    writer.write("======\n");
+
+    // Content
+    if (answer == null || answer.isEmpty()) {
+      writer.write("Sorry, we did not understand your query.\n");
+    } else {
+      writer.write(answer);
+    }
+
+    // Byte streams
+    InputStream inputStream = new FileInputStream(markdown);
+    OutputStream outputStream = new FileOutputStream(markdown);
+    inputStream.transferTo(outputStream);
+
+    // Remove temporary file
+    markdown.delete();
+  }
+}