from: add page (#5011)

pages/common/from.md

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+# from
+
+> Prints mail header lines from the current user's mailbox.
+> More information: <https://mailutils.org/manual/html_chapter/Programs.html#frm-and-from>.
+
+- List mail:
+
+`from`
+
+- Display the number of messages stored:
+
+`from --count`
+
+- List mail in the specified mailbox directory:
+
+`MAIL={{path/to/mailbox}} from`
+
+- Print the mail from the specified address:
+
+`from --sender={{me@example.com}}`