Pdf to markdown (#2730)

# Description

Please provide a summary of the changes, including relevant motivation
and context.

Closes #(issue_number)

## Checklist

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have performed a self-review of my own code
- [ ] I have attached images of the change if it is UI based
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] If my code has heavily changed functionality I have updated
relevant docs on [Stirling-PDFs doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
- [ ] My changes generate no new warnings
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

---------

Co-authored-by: a <a>

src/main/java/stirling/software/SPDF/model/api/converters/ConvertPDFToMarkdown.java

@@ -0,0 +1,32 @@
+package stirling.software.SPDF.model.api.converters;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.multipart.MultipartFile;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+
+import stirling.software.SPDF.model.api.PDFFile;
+import stirling.software.SPDF.utils.PDFToFile;
+
+@RestController
+@Tag(name = "Convert", description = "Convert APIs")
+@RequestMapping("/api/v1/convert")
+public class ConvertPDFToMarkdown {
+
+    @PostMapping(consumes = "multipart/form-data", value = "/pdf/markdown")
+    @Operation(
+            summary = "Convert PDF to Markdown",
+            description =
+                    "This endpoint converts a PDF file to Markdown format. Input:PDF Output:Markdown Type:SISO")
+    public ResponseEntity<byte[]> processPdfToMarkdown(@ModelAttribute PDFFile request)
+            throws Exception {
+        MultipartFile inputFile = request.getFileInput();
+        PDFToFile pdfToFile = new PDFToFile();
+        return pdfToFile.processPdfToMarkdown(inputFile);
+    }
+}