Add project URLs

Author: jbussemaker

pyproject.toml

@@ -21,6 +21,10 @@ dependencies = [
     "pint",
 ]
 
+[project.urls]
+Repository = "https://github.com/jbussemaker/SysML-v2-Python-Units"
+Documentation = "https://github.com/jbussemaker/SysML-v2-Python-Units/blob/main/documentation.ipynb"
+
 [project.optional-dependencies]
 test = [
     "pytest"