[ci skip] add test plugin module

test-plugin/build.gradle.kts

@@ -0,0 +1,17 @@
+version = "1.0.0-SNAPSHOT"
+
+dependencies {
+    compileOnly(project(":purpur-api"))
+}
+
+tasks.processResources {
+    val apiVersion = rootProject.providers.gradleProperty("mcVersion").get()
+    val props = mapOf(
+        "version" to project.version,
+        "apiversion" to "\"$apiVersion\"",
+    )
+    inputs.properties(props)
+    filesMatching("paper-plugin.yml") {
+        expand(props)
+    }
+}