add License SQLAlchemy ORM model

Signed-off-by: Kevin Morris <kevr@0cost.org>

aurweb/models/license.py

+from sqlalchemy.orm import mapper
+
+from aurweb.schema import Licenses
+
+
+class License:
+    def __init__(self, Name: str = None):
+        self.Name = Name
+
+
+mapper(License, Licenses)

test/test_license.py

+import pytest
+
+from sqlalchemy.exc import IntegrityError
+
+from aurweb.db import create
+from aurweb.models.license import License
+from aurweb.testing import setup_test_db
+
+
+@pytest.fixture(autouse=True)
+def setup():
+    setup_test_db("Licenses")
+
+
+def test_license_creation():
+    license = create(License, Name="Test License")
+    assert bool(license.ID)
+    assert license.Name == "Test License"
+
+
+def test_license_null_name_raises_exception():
+    from aurweb.db import session
+    with pytest.raises(IntegrityError):
+        create(License)
+    session.rollback()