Add README

README.md

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+# wiki.php.net
+
+# Upgrades
+
+ - Follow https://www.dokuwiki.org/install:upgrade
+ - Instead of unpacking on the server, unpack in your local Git directory
+ - Restore `register.txt` via `git restore -- dokuwiki/inc/lang/en/register.txt`
+ - Review the changes (not every detail in larger upgrades of course)
+ - Commit and push
+ - Pull on the server (`/srv/web-wiki`)