create a SQLiteOpenHelper for storing the launchers

app/src/main/kotlin/com/simplemobiletools/applauncher/DbHelper.kt

@@ -0,0 +1,28 @@
+package com.simplemobiletools.applauncher
+
+import android.content.Context
+import android.database.sqlite.SQLiteDatabase
+import android.database.sqlite.SQLiteOpenHelper
+
+class DbHelper(context: Context) : SQLiteOpenHelper(context, "launchers.db", null, 1) {
+    val TABLE = "launchers"
+    val CREATE_DB = "CREATE TABLE $TABLE (" +
+            "$ID integer PRIMARY KEY autoincrement," +
+            "$NAME TEXT," +
+            "$PKG_NAME TEXT" +
+            ")"
+
+    companion object {
+        val ID: String = "_id"
+        val NAME: String = "name"
+        val PKG_NAME: String = "pkgName"
+    }
+
+    override fun onCreate(db: SQLiteDatabase) {
+        db.execSQL(CREATE_DB)
+    }
+
+    override fun onUpgrade(db: SQLiteDatabase?, oldVersion: Int, newVersion: Int) {
+
+    }
+}