Update 60.4. Example repackage implementation.md

VIII. Build tool plugins/60.4. Example repackage implementation.md

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+### 60.4. repackage实现示例
+
+这里是一个传统的repackage示例：
+```java
+Repackager repackager = new Repackager(sourceJarFile);
+repackager.setBackupSource(false);
+repackager.repackage(new Libraries() {
+            @Override
+            public void doWithLibraries(LibraryCallback callback) throws IOException {
+                // Build system specific implementation, callback for each dependency
+                // callback.library(new Library(nestedFile, LibraryScope.COMPILE));
+            }
+        });
+```