add build config

Author: MrXiaoM

build.gradle.kts

@@ -3,6 +3,7 @@ plugins {
     kotlin("jvm") version kotlinVersion
     kotlin("plugin.serialization") version kotlinVersion
 
+    id("com.github.gmazzo.buildconfig") version "3.1.0"
     id("net.mamoe.mirai-console") version "2.16.0"
 }
 
@@ -16,6 +17,14 @@ repositories {
     mavenCentral()
 }
 
+buildConfig {
+    className("BuildConstants")
+    packageName("org.example.mirai.plugin")
+    useKotlinOutput()
+
+    buildConfigField("String", "VERSION", "\"${project.version}\"")
+}
+
 mirai {
     noTestCore = true
     setupConsoleTestRuntime {

src/main/java/org/example/mirai/plugin/JavaPluginMain.java

@@ -35,7 +35,7 @@ public final class JavaPluginMain extends JavaPlugin {
     public static final JavaPluginMain INSTANCE = new JavaPluginMain();
 
     private JavaPluginMain() {
-        super(new JvmPluginDescriptionBuilder("org.example.mirai-example", "0.1.0")
+        super(new JvmPluginDescriptionBuilder("org.example.mirai-example", BuildConstants.VERSION)
                 .info("EG")
                 .build());
     }

src/main/kotlin/PluginMain.kt

@@ -36,7 +36,7 @@ object PluginMain : KotlinPlugin(
     JvmPluginDescription(
         id = "org.example.mirai-example",
         name = "插件示例",
-        version = "0.1.0"
+        version = BuildConstants.VERSION
     ) {
         author("作者名称或联系方式")
         info(