📦 NEW: implement local data source in the form of a cache using a room DB

Signed-off-by: Jonas Sulzer <jonas@violoncello.ch>

Author: violoncelloCH

app/src/main/java/com/github/swent/echo/data/repository/datasources/Cache.kt

@@ -0,0 +1,21 @@
+package com.github.swent.echo.data.repository.datasources
+
+import android.app.Application
+import androidx.room.Room
+import com.github.swent.echo.data.room.AppDatabase
+import com.github.swent.echo.data.room.Converters
+
+class Cache(application: Application) : LocalDataSource {
+    val db =
+        Room.databaseBuilder(
+                application.applicationContext,
+                AppDatabase::class.java,
+                "echo-cache-db"
+            )
+            .addTypeConverter(Converters())
+            .build()
+
+    override fun getLocalData(): String {
+        TODO("Not yet implemented")
+    }
+}