Refine database import export

app/src/main/java/com/hippo/ehviewer/dao/BasicDao.java

@@ -0,0 +1,8 @@
+package com.hippo.ehviewer.dao;
+
+import java.util.List;
+
+public interface BasicDao<T> {
+    List<T> fakeList();
+    void fakeInsert(T t);
+}