[ci skip] add test plugin module

test-plugin/src/main/java/org/purpurmc/testplugin/TestPlugin.java

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+package org.purpurmc.testplugin;
+
+import org.bukkit.event.Listener;
+import org.bukkit.plugin.java.JavaPlugin;
+
+public class TestPlugin extends JavaPlugin implements Listener {
+
+    @Override
+    public void onEnable() {
+        this.getServer().getPluginManager().registerEvents(this, this);
+    }
+}

test-plugin/src/main/java/org/purpurmc/testplugin/TestPluginBootstrap.java

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+package org.purpurmc.testplugin;
+
+public class TestPluginBootstrap {
+}

test-plugin/src/main/java/org/purpurmc/testplugin/TestPluginLoader.java

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+package org.purpurmc.testplugin;
+
+public class TestPluginLoader {
+}

test-plugin/src/main/resources/paper-plugin.yml

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+name: Purpur-Test-Plugin
+version: ${version}
+main: org.purpurmc.testplugin.TestPlugin
+description: Purpur Test Plugin
+author: PurpurMC
+api-version: ${apiversion}
+load: STARTUP
+bootstrapper: org.purpurmc.testplugin.TestPluginBootstrap
+loader: org.purpurmc.testplugin.TestPluginLoader
+defaultPerm: FALSE
+permissions:
+dependencies: