feat: Add user directory and initial book app features (mridhila_sankar)

create_book.txt

@@ -1,3 +1,4 @@
 "This is the feature for the author to add a new book."
 The feature also allows users to quickly search and navigate through their collection, making book management easier.
 This feature also supports quick search and filtering to help users efficiently navigate their book list.
+This is the feature for the author to add a new book.

mridhila_sankar_book_app/list_all_books.txt

@@ -0,0 +1 @@
+This is the feature which shows the user all the books they’ve created as a list.