修改pom.xml文件,新增各子系统接口文件

Change-Id: Iec5c52a44f09accbda6c0e227b55f7572a06204a
diff --git a/src/main/java/database/Database2.java b/src/main/java/database/Database2.java
new file mode 100644
index 0000000..2e37a99
--- /dev/null
+++ b/src/main/java/database/Database2.java
@@ -0,0 +1,5 @@
+package database;
+
+// public class Database2 implements DataManagerInterface {
+    
+// }