Added the sqlite3 database

backend/app/routers/dewar.py

@@ -0,0 +1,19 @@
+from fastapi import APIRouter, HTTPException, status
+from typing import List, Optional
+import uuid
+from app.data.data import dewars, contacts, return_addresses
+from app.models import Dewar, ContactPerson, Address
+
+
+router = APIRouter()
+
+@router.get("/", response_model=List[Dewar])
+async def get_dewars():
+    return dewars
+
+@router.post("/", response_model=Dewar, status_code=status.HTTP_201_CREATED)
+async def create_dewar(dewar: Dewar) -> Dewar:
+    dewar_id = f'DEWAR-{uuid.uuid4().hex[:8].upper()}'
+    dewar.id = dewar_id
+    dewars.append(dewar)
+    return dewar