Add TODO for word matching

lib/models/word_search/word_search_result.dart

@@ -34,6 +34,10 @@ class WordSearchResult {
   /// A class listing the sources used to make up the data for this word search result.
   final WordSearchSources sources;
 
+  // TODO: Create a list containing pointers to the matched parts of the word (either kanjiInfo, readingInfo, senses),
+  //       as well as spans for the subpart of the string that matched. This will be used for highlighting, and displaying
+  //       alternative kanji/kana forms later on.
+
   const WordSearchResult({
     required this.score,
     required this.entryId,