git-send-email: add page (#3953)

pages/common/git-send-email.md

@@ -0,0 +1,25 @@
+# git send-email
+
+> Send a collection of patches as emails.
+> Patches can be specified as files, directions, or a revision list.
+> More information: https://git-scm.com/docs/git-send-email
+
+- Send the last commit in the current branch:
+
+`git send-email -1`
+
+- Send a given commit:
+
+`git send-email -1 {{commit}}`
+
+- Send multiple (e.g. 10) commits in the current branch:
+
+`git send-email -10`
+
+- Send an extra mail before the patch mail(s) (e.g. an introduction to the patch set as a cover letter) and edit the mail(s) to be sent:
+
+`git send-email -{{number of commits} --cover-letter --annotate
+
+- Send the last commit in the current branch with the patch version (e.g. 2) indicated in the subject header (to appear as [PATCH v2]):
+
+`git send-email -v2 -1`