Creates initial app database class and adds minimal DTO support for monsters.

app/src/main/java/com/majinnaibu/monstercards/data/MonsterDAO.java

@@ -0,0 +1,32 @@
+package com.majinnaibu.monstercards.data;
+
+
+import androidx.room.Dao;
+import androidx.room.Delete;
+import androidx.room.Insert;
+import androidx.room.Query;
+
+import com.majinnaibu.monstercards.models.Monster;
+
+import java.util.List;
+
+import io.reactivex.rxjava3.core.Completable;
+import io.reactivex.rxjava3.core.Flowable;
+
+@Dao
+public interface MonsterDAO {
+    @Query("SELECT * FROM monster")
+    Flowable<List<Monster>> getAll();
+
+    @Query("SELECT * FROM monster WHERE id IN (:monsterIds)")
+    Flowable<List<Monster>> loadAllByIds(String[] monsterIds);
+
+    @Query("SELECT * FROM monster WHERE name LIKE :name LIMIT 1")
+    Flowable<Monster> findByName(String name);
+
+    @Insert
+    Completable insertAll(Monster... monsters);
+
+    @Delete
+    Completable delete(Monster monster);
+}