feat: add classe AppDatabase

app/src/main/java/br/com/connectattoo/local/database/AppDatabase.kt

@@ -0,0 +1,28 @@
+package br.com.connectattoo.local.database
+
+import android.content.Context
+import androidx.room.Room
+import androidx.room.RoomDatabase
+
+
+abstract class AppDatabase : RoomDatabase(){
+
+    companion object {
+
+        private const val DATABASE_NAME: String = "connectattoo-database"
+
+        @Volatile
+        private var INSTANCE: AppDatabase? = null
+
+        fun getInstance(context: Context): AppDatabase =
+            INSTANCE ?: synchronized(this) {
+                INSTANCE ?: buildDatabase(context).also { INSTANCE = it }
+            }
+
+        private fun buildDatabase(context: Context) =
+            Room.databaseBuilder(
+                context.applicationContext,
+                AppDatabase::class.java, DATABASE_NAME
+            ).build()
+    }
+}