Add 'git-obs pr' command

osc/commands_git/pr.py

@@ -0,0 +1,19 @@
+import osc.commandline_git
+
+
+# we decided not to use the command name 'pull' because that could be confused
+# with the completely unrelated 'git pull' command
+
+
+class PullRequestCommand(osc.commandline_git.GitObsCommand):
+    """
+    Manage pull requests
+    """
+
+    name = "pr"
+
+    def init_arguments(self):
+        pass
+
+    def run(self, args):
+        self.parser.print_help()