Add licensing and provenance documentation

PROJECT_IDENTITY.md

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+# LevelRange-Octo project identity
+
+## Canonical project
+
+The canonical repository designated by the current maintainer is:
+
+- https://github.com/Dusk-92/LevelRange-Octo
+
+Mirrors, package caches, downstream forks, repackaged copies and modified
+versions hosted elsewhere are independent unless the canonical project
+explicitly states otherwise.
+
+## Independent community project
+
+LevelRange-Octo is an independent community-maintained fork.
+
+It is not affiliated with, sponsored by, approved by or endorsed by Blizzard
+Entertainment, Turtle WoW, OctoWoW, FlightMap, the original LevelRange authors
+or any other referenced project unless explicitly stated by that party.
+
+Compatibility with World of Warcraft 1.12-compatible clients, Turtle WoW-like
+environments, OctoWoW or FlightMap does not imply affiliation, endorsement,
+partnership or ownership.
+
+World of Warcraft, Warcraft, Blizzard Entertainment and associated names,
+marks, artwork and game assets remain the property of their respective rights
+holders.
+
+## Known fork chain
+
+The current GitHub fork chain is:
+
+- https://github.com/Tenyar97/LevelRange-Turtle
+- https://github.com/Spartelfant/LevelRange-Turtle
+- https://github.com/Dusk-92/LevelRange-Octo
+
+The historical source also credits the original LevelRange addon by
+Philip Hughes (Bull3t).
+
+## Support boundary
+
+Dusk-92 is responsible only for changes and releases published by the canonical
+LevelRange-Octo repository. Historical authors, upstream maintainers and
+compatibility-target projects are not responsible for this fork's changes or
+current behavior.