Folderをデータベースに保存するように WIP

source/src/main/java/one/nem/lacerta/source/database/dao/FolderDao.java

@@ -0,0 +1,8 @@
+package one.nem.lacerta.source.database.dao;
+
+import androidx.room.Dao;
+
+@Dao
+public interface FolderDao {
+
+}

source/src/main/java/one/nem/lacerta/source/database/entity/FolderEntity.java

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+package one.nem.lacerta.source.database.entity;
+
+import androidx.annotation.NonNull;
+import androidx.room.ColumnInfo;
+import androidx.room.Entity;
+import androidx.room.PrimaryKey;
+
+@Entity(tableName = "folder")
+public class FolderEntity {
+
+    @PrimaryKey
+    @ColumnInfo(name = "id")
+    @NonNull
+    public String id; // フォルダID
+
+    @ColumnInfo(name = "title")
+    public String name; // フォルダ名
+
+}