build: establish Tree Feller project

src/main/resources/config.yml

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+# Tree Feller settings are introduced and validated by US-008.

src/main/resources/plugin.yml

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+name: TreeFeller
+version: ${version}
+main: games.dmg.treefeller.TreeFellerPlugin
+api-version: "1.20"
+description: Earn and use safe, animated tree felling by species.
+author: dmg.games
+commands:
+  treefeller:
+    description: Control personal tree felling and inspect unlocks.
+    usage: /treefeller <enabled|unlocked|undo>
+    permission: treefeller.command
+  treefelleradmin:
+    description: Administer Tree Feller players and thresholds.
+    usage: /treefelleradmin <player|threshold>
+    permission: treefeller.admin
+permissions:
+  treefeller.command:
+    description: Allows access to Tree Feller player commands.
+    default: true
+  treefeller.undo:
+    description: Allows a player to undo their latest felling.
+    default: true
+  treefeller.admin:
+    description: Allows administration of Tree Feller.
+    default: op