Fully documented all Kotlin files and added TODOs to functions that need to be updated in some way

app/src/main/java/com/denizk0461/studip/model/DietaryPreferences.kt

@@ -1,5 +1,13 @@
 package com.denizk0461.studip.model
 
+/**
+ * Enumeration that can be used in conjunction with DietaryPrefObject.kt to more concisely look up,
+ * specify, and iterate through dietary preferences. Order of these elements matches the order used
+ * on the website of the Studierendenwerk Bremen.
+ *
+ * @param value string value that can be used where the enum value itself cannot be used (e.g.
+ *              SharedPreferences)
+ */
 enum class DietaryPreferences(val value: String) {
     FAIR("isFair"),
     FISH("isFish"),