added a licence file and SPDX decl`

LICENSE.txt

+MIT License
+
+Copyright (c) 2022 GÉANT Vereniging
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
\ No newline at end of file

setup.py

@@ -6,7 +6,7 @@ setup(
     author="GEANT",
     author_email="swd@geant.org",
     description="Stripe custom checkout support service",
-    url=("TBD"),
+    url=("https://gitlab.software.geant.org/geant-swd/stripe-checkout"),
     packages=find_packages(),
     install_requires=[
         "django~=4.2.18",
@@ -29,4 +29,6 @@ setup(
         ]
     },
     include_package_data=True,
+    license='MIT',
+    license_files=['LICENSE.txt']
 )