Add Database helper, can save marker in stop table and read it

app/src/main/java/com/example/busroute/Database/Stop.kt

@@ -0,0 +1,22 @@
+package com.example.busroute.Database
+
+import android.provider.BaseColumns
+
+object StopContract {
+    // Table contents are grouped together in an anonymous object.
+    object StopEntry : BaseColumns {
+        const val TABLE_NAME = "stop"
+        const val LATITUDE = "latitude"
+        const val LONGITUDE = "longitude"
+        const val ORDER = "'order'"
+    }
+
+    const val SQL_CREATE_ENTRIES =
+        "CREATE TABLE ${StopEntry.TABLE_NAME} (" +
+                "${BaseColumns._ID} INTEGER PRIMARY KEY," +
+                "${StopEntry.LATITUDE} DOUBLE, "+
+                "${StopEntry.LONGITUDE} DOUBLE, "+
+                "${StopEntry.ORDER} INTEGER)"
+
+    const val SQL_DELETE_ENTRIES = "DROP TABLE IF EXISTS ${StopEntry.TABLE_NAME}"
+}