add py.typed (#1310)

* feat: Create py.typed

* chore: Update setup.py to support py.typed

* Update setup.py

Author: Goldziher

pygit2/py.typed

@@ -0,0 +1 @@
+# python type marker, see: https://peps.python.org/pep-0561/

setup.py

@@ -82,6 +82,7 @@ def exclude(line):
     'Programming Language :: Python :: Implementation :: PyPy',
     'Programming Language :: Python :: Implementation :: CPython',
     'Topic :: Software Development :: Version Control',
+    'Typing :: Typed',
 ]
 
 __dir__ = Path(__file__).parent
@@ -144,7 +145,7 @@ def run(self):
     long_description=long_description,
     long_description_content_type='text/markdown',
     packages=['pygit2'],
-    package_data={'pygit2': ['decl/*.h', '*.pyi']},
+    package_data={'pygit2': ['decl/*.h', '*.pyi', 'py.typed']},
     zip_safe=False,
     cmdclass=cmdclass,
     cffi_modules=['pygit2/_run.py:ffi'],