add：SmallInteger()

README.md

@@ -614,6 +614,7 @@ Available Model Fields (with required args - optional ones in docs):
 * `Time()`
 * `DateTime()`
 * `JSON()`
+* `SmallInteger()`
 * `BigInteger()`
 * `Decimal(scale, precision)`
 * `UUID()`

ormar/fields/model_fields.py

@@ -538,6 +538,54 @@ else:
                 )
 
 
+class SmallInteger(Integer, int):
+    """
+    SmallInteger field factory that construct Field classes and populated their values.
+    """
+
+    _type = int
+    _sample = 0
+
+    def __new__(  # type: ignore
+        cls,
+        *,
+        minimum: int = None,
+        maximum: int = None,
+        multiple_of: int = None,
+        **kwargs: Any
+    ) -> BaseField:
+        autoincrement = kwargs.pop("autoincrement", None)
+        autoincrement = (
+            autoincrement
+            if autoincrement is not None
+            else kwargs.get("primary_key", False)
+        )
+        kwargs = {
+            **kwargs,
+            **{
+                k: v
+                for k, v in locals().items()
+                if k not in ["cls", "__class__", "kwargs"]
+            },
+        }
+        kwargs["ge"] = kwargs["minimum"]
+        kwargs["le"] = kwargs["maximum"]
+        return super().__new__(cls, **kwargs)
+
+    @classmethod
+    def get_column_type(cls, **kwargs: Any) -> Any:
+        """
+        Return proper type of db column for given field type.
+        Accepts required and optional parameters that each column type accepts.
+
+        :param kwargs: key, value pairs of sqlalchemy options
+        :type kwargs: Any
+        :return: initialized column with proper options
+        :rtype: sqlalchemy Column
+        """
+        return sqlalchemy.SmallInteger()
+
+
 class BigInteger(Integer, int):
     """
     BigInteger field factory that construct Field classes and populated their values.