git-paste: add page (#10992)

* git-paste: add page

---------

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/common/git-paste.md

@@ -0,0 +1,13 @@
+# git paste
+
+> Send commits to a pastebin site using `pastebinit`.
+> Part of `git-extras`.
+> More information: <https://github.com/tj/git-extras/blob/master/Commands.md#git-paste>.
+
+- Send the patches between the current branch and its upstream to a pastebin using `pastebinit`:
+
+`git paste`
+
+- Pass options to `git format-patch` in order to select a different set of commits (`@^` selects the parent of HEAD, and so the currently checked out commit is sent):
+
+`git paste {{@^}}`