setup: add project URLs

Author: benoit-pierre

setup.cfg

@@ -8,6 +8,9 @@ author = Benoit Pierre
 author_email = benoit.pierre@gmail.com
 license = GNU General Public License v2 or later (GPLv2+)
 url = https://github.com/benoit-pierre/plover_plugins_manager
+project_urls =
+    Source Code = https://github.com/benoit-pierre/plover_plugins_manager
+    Issue Tracker = https://github.com/benoit-pierre/plover_plugins_manager/issues
 classifiers =
 	Development Status :: 4 - Beta
 	Environment :: Plugins