git-rscp: add page (#10996)

pages/common/git-rscp.md

@@ -0,0 +1,9 @@
+# git rscp
+
+> This command is an alias of `git scp`, to copy files from the current working tree to the working directory of a remote repository.
+> Part of `git-extras`.
+> More information: <https://github.com/tj/git-extras/blob/master/Commands.md#git-scp>.
+
+- View documentation for the original command:
+
+`tldr git scp`