feat: update readme

build.gradle

@@ -11,6 +11,9 @@ repositories {
     maven() { url 'https://maven.aliyun.com/repository/central' }
     mavenCentral()
     jcenter()
+    if (addRepo.exists()) {
+        maven() { url addRepo.text.trim() }
+    }
 }
 
 dependencies {