Add: Room database (2/5 in replacing SQLite with Room)

src/main/kotlin/com/looker/droidify/database/DatabaseX.kt

@@ -0,0 +1,41 @@
+package com.looker.droidify.database
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+
+@Database(
+    entities = [
+        Repository::class,
+        Product::class,
+        Category::class,
+        Installed::class,
+        Lock::class
+    ], version = 1
+)
+abstract class DatabaseX : RoomDatabase() {
+    // TODO add the DAOs for the tables
+
+    companion object {
+        @Volatile
+        private var INSTANCE: DatabaseX? = null
+
+        fun getInstance(context: Context): DatabaseX {
+            synchronized(this) {
+                if (INSTANCE == null) {
+                    INSTANCE = Room
+                        .databaseBuilder(
+                            context.applicationContext,
+                            DatabaseX::class.java,
+                            "main_database.db"
+                        )
+                        .fallbackToDestructiveMigration()
+                        .allowMainThreadQueries()
+                        .build()
+                }
+                return INSTANCE!!
+            }
+        }
+    }
+}