Add Country schema

schemas/country.py

@@ -0,0 +1,15 @@
+from pydantic import BaseModel, Field
+
+class CountryBase(BaseModel):
+    name: str = Field(..., max_length=100, description="Country name", example="United States")
+    code: str = Field(..., min_length=3, max_length=3, description="Country code", example="USA")
+    population: int = Field(..., gt=0, description="Country population", example=330000000)
+
+    class Config:
+        orm_mode = True
+
+class CountryCreate(CountryBase):
+    pass
+
+class CountryResponse(CountryBase):
+    pass