added pdf implementation demo files

PdfParameter.java

@@ -0,0 +1,41 @@
+package com.example.reporting.services.impl.pdf;
+
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+
+import com.example.reporting.dto.database.ReportDto;
+
+/**
+ * Interface for PDF Parameter
+ */
+interface PdfParameter {
+
+	/**
+	 * Returns the filename for the content disposition header.
+	 *
+	 * @param dto The ReportDto object to extract the filename from.
+	 * @return The filename for the content disposition header.
+	 */
+	public abstract String getContentDispositionFilename(ReportDto dto);
+
+	/**
+	 * Returns the HttpHeaders for the PDF response.
+	 *
+	 * @return The HttpHeaders for the PDF response.
+	 */
+	public abstract HttpHeaders headers();
+
+	/**
+	 * Returns the HttpHeaders for the PDF response.
+	 *
+	 * @param dto The ReportDto object to extract the headers from.
+	 * @return The HttpHeaders for the PDF response.
+	 */
+	public default HttpHeaders headers(ReportDto dto) {
+		HttpHeaders headers = new HttpHeaders();
+		headers.setContentType(MediaType.APPLICATION_PDF);
+		headers.setContentDispositionFormData("attachment", getContentDispositionFilename(dto));
+
+		return headers;
+	}
+}