Add Country schema

schemas/country.py

@@ -0,0 +1,26 @@
+from pydantic import BaseModel, Field
+
+class CountryBase(BaseModel):
+    name: str = Field(..., index=True, unique=True, description="Country name")
+    code: str = Field(..., min_length=3, max_length=3, description="Country code (3 characters)")
+    population: int = Field(..., gt=0, description="Country population")
+    area: int = Field(..., gt=0, description="Country area")
+
+    class Config:
+        schema_extra = {
+            "example": {
+                "name": "United States",
+                "code": "USA",
+                "population": 329500000,
+                "area": 9833520
+            }
+        }
+
+class CountryCreate(CountryBase):
+    pass
+
+class CountryResponse(CountryBase):
+    id: int
+
+    class Config:
+        orm_mode = True