Add SQLAlchemy and database boilerplate code

tofu_api/models/__init__.py

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+from .task import Task

tofu_api/models/task.py

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+from sqlalchemy import Column, Integer, String, Text
+
+from tofu_api.common.database import Model
+
+
+class Task(Model):
+    """
+    Database model for tasks.
+    """
+
+    __tablename__ = 'tasks'
+
+    id: int = Column(Integer, nullable=False, primary_key=True)
+    # TODO: created_at, modified_at
+
+    title: str = Column(String(255), nullable=False)
+    description: str = Column(Text, nullable=False, default='')
+
+    def to_dict(self) -> dict:
+        # TODO: Implement a generic to_dict() in the base model
+        return {
+            'id': self.id,
+            'title': self.title,
+            'description': self.description,
+        }