Initial Redmine tooling and local plugin forks

plugins/README.md

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+# Local Redmine Plugin Forks
+
+This directory is the tracked source of truth for local Redmine plugin work.
+
+The ignored `redmine-copy/` tree is a working/reference copy of the full legacy
+Redmine install. Make plugin edits here first, then deploy or copy them into the
+test Redmine instance or `redmine-copy/` as needed.
+
+Tracked plugin folders:
+
+- `redmine_event_outbox` - local event outbox plugin.
+- `redmine_contacts` - RedmineUP contacts plugin with local compatibility fixes.
+- `redmine_contacts_helpdesk` - RedmineUP helpdesk plugin with local API and
+  mail compatibility fixes.