Refactor to organise the project and change visibility modifiers

app/src/main/java/com/denizd/substitutionplan/models/Subst.kt

@@ -0,0 +1,11 @@
+package com.denizd.substitutionplan.models
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "subst_table")
+internal class Subst(val group: String, val date: String, val time: String, val course: String, val room: String, val additional: String, val priority: Int) {
+
+    @PrimaryKey(autoGenerate = true)
+    var id: Int = 0
+}