Added TELL spreadsheet template

backend/app/routers/spreadsheet.py

@@ -1,11 +1,26 @@
 from fastapi import APIRouter, UploadFile, File, HTTPException
 import logging
 from app.services.spreadsheet_service import SampleSpreadsheetImporter, SpreadsheetImportError
+from fastapi.responses import FileResponse
+import os
 
 router = APIRouter()
 logger = logging.getLogger(__name__)
 
 
+@router.get("/download-template", response_class=FileResponse)
+async def download_template():
+    # Constructing the absolute path
+    current_dir = os.path.dirname(__file__)
+    template_path = os.path.join(current_dir, "../../downloads/V7_TELLSamplesSpreadsheetTemplate.xlsx")
+
+    if not os.path.exists(template_path):
+        raise HTTPException(status_code=404, detail="Template file not found.")
+
+    return FileResponse(template_path, filename="V7_TELLSamplesSpreadsheetTemplate.xlsx",
+                        media_type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
+
+
 @router.post("/upload")
 async def upload_file(file: UploadFile = File(...)):
     try: