Move files for GitHub to .github directory (#5989)

.github/CODEOWNERS

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+# CODEOWNERS for tootsuite/mastodon
+
+# Translators
+# To add translator, copy these lines, replace `fr` with appropriate language code and replace `@żelipapą` with user's GitHub nickname preceded by `@` sign or e-mail address.
+# /app/javascript/mastodon/locales/fr.json @żelipapą
+# /app/views/user_mailer/*.fr.html.erb @żelipapą
+# /app/views/user_mailer/*.fr.text.erb @żelipapą
+# /config/locales/*.fr.yml @żelipapą
+# /config/locales/fr.yml @żelipapą
+
+# Polish
+/app/javascript/mastodon/locales/pl.json @m4sk1n
+/app/views/user_mailer/*.pl.html.erb @m4sk1n
+/app/views/user_mailer/*.pl.text.erb @m4sk1n
+/config/locales/*.pl.yml @m4sk1n
+/config/locales/pl.yml @m4sk1n
+
+# French
+/app/javascript/mastodon/locales/fr.json @aldarone
+/app/javascript/mastodon/locales/whitelist_fr.json @aldarone
+/app/views/user_mailer/*.fr.html.erb @aldarone
+/app/views/user_mailer/*.fr.text.erb @aldarone
+/config/locales/*.fr.yml @aldarone
+/config/locales/fr.yml @aldarone
+
+# Dutch
+/app/javascript/mastodon/locales/nl.json @jeroenpraat
+/app/javascript/mastodon/locales/whitelist_nl.json @jeroenpraat
+/app/views/user_mailer/*.nl.html.erb @jeroenpraat
+/app/views/user_mailer/*.nl.text.erb @jeroenpraat
+/config/locales/*.nl.yml @jeroenpraat
+/config/locales/nl.yml @jeroenpraat

.github/ISSUE_TEMPLATE.md

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+[Issue text goes here].
+
+* * * *
+
+- [ ] I searched or browsed the repo’s other issues to ensure this is not a duplicate.
+- [ ] This bug happens on a [tagged release](https://github.com/tootsuite/mastodon/releases) and not on `master` (If you're a user, don't worry about this).