n/coauthor.md: initial commit

Resolves: #186

n/coauthor.md

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+---
+layout: null
+permalink: /n/coauthor.html
+sitemap: false
+---
+
+# Git forge private emails
+
+**_WARNING1 These are vendor lock-in and contribution activity will not
+pass on to other platrforms._** It may not matter much with sign-offs though.
+
+Forges generally have a feature for private email addresses and it can be
+used at least by co-authored commits, e.g. [r/coauthor](/r/coauthor.html):
+
+> `Co-authored-by: NAME <NAME@EXAMPLE.COM>`
+
+or
+
+> `Signed-off-by: Aminda Suomalainen <831184+Mikaela@users.noreply.github.com`
+
+which is produced by `git commit -s`
+
+<!-- editorconfig-checker-disable -->
+<!-- prettier-ignore-start -->
+
+<!-- START doctoc generated TOC please keep comment here to allow auto update -->
+<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
+
+- [My private emails](#my-private-emails)
+- [Where to find them](#where-to-find-them)
+
+<!-- END doctoc generated TOC please keep comment here to allow auto update -->
+
+<!-- prettier-ignore-end -->
+<!-- editorconfig-checker-enable -->
+
+## My private emails
+
+- `github.com`: `831184+Mikaela@users.noreply.github.com`
+- `gitlab.com`: `54757-Mikaela@users.noreply.gitlab.com`
+
+## Where to find them
+
+<!-- NOTE: Try to keep same order as the list above. -->
+
+- https://github.com/settings/emails
+- https://gitlab.com/-/profile