Adds some missing comments

src/main/java/net/knarcraft/bookswithoutborders/BooksWithoutBorders.java

@@ -55,25 +55,15 @@ import static net.knarcraft.bookswithoutborders.utility.InputCleaningHelper.clea
 
 public class BooksWithoutBorders extends JavaPlugin {
 
-    //Limit for duplicates of a book
     private static int bookDuplicateLimit;
-    //The separating string between the book title and the book author
     private static String titleAuthorSeparator;
-    //Separator to force Lore newline
     private static String loreSeparator;
-    //Books to give players on first login
     private static List<String> firstBooks;
-    //Message to display to new players
     private static String welcomeMessage;
-    //The material used for payment
     private static Material bookPriceType = null;
-    //The number of items/currency to pay for each transaction
     private static double bookPriceQuantity;
-    //Whether only the author of a book should be allowed to copy the book
     private static boolean authorOnlyCopy;
-    //Whether to use YML files instead of TXT files for saving books
     private static boolean useYml;
-    //Whether admins should be able to decrypt group encrypted books without belonging to its group
     private static boolean adminDecrypt;
 
     private static ItemFactory itemFactory;
@@ -101,30 +91,66 @@ public class BooksWithoutBorders extends JavaPlugin {
         registerCommands();
     }
 
+    /**
+     * Gets whether only the author of a book should be able to copy it
+     * @return <p>Whether only the book author can copy it</p>
+     */
     public static boolean getAuthorOnlyCopy() {
         return authorOnlyCopy;
     }
 
+    /**
+     * Gets whether to use YML, not TXT, for saving books
+     * @return <p>Whether to use YML for saving books</p>
+     */
     public static boolean getUseYml() {
         return useYml;
     }
 
+    /**
+     * Gets whether admins should be able to decrypt books without a password, and decrypt all group encrypted books
+     * @return <p>Whether admins can bypass the encryption password</p>
+     */
     public static boolean getAdminDecrypt() {
         return adminDecrypt;
     }
 
+    /**
+     * Sets the quantity of items/currency necessary for copying books
+     * @param newQuantity <p>The new quantity necessary for payment</p>
+     */
     public static void setBookPriceQuantity(double newQuantity) {
         bookPriceQuantity = newQuantity;
     }
 
+    /**
+     * Gets the quantity of items/currency necessary for copying books
+     * @return <p>The quantity necessary for payment</p>
+     */
     public static double getBookPriceQuantity() {
         return bookPriceQuantity;
     }
 
+    /**
+     * Sets the item type used for book pricing
+     *
+     * <p>This item is the one a player has to pay for copying books. AIR is used to denote economy. null is used if
+     * payment is disabled. Otherwise, any item can be used.</p>
+     *
+     * @param newType <p>The new item type to use for book pricing</p>
+     */
     public static void setBookPriceType(Material newType) {
         bookPriceType = newType;
     }
 
+    /**
+     * Gets the item type used for book pricing
+     *
+     * <p>This item is the one a player has to pay for copying books. AIR is used to denote economy. null is used if
+     * payment is disabled. Otherwise, any item can be used.</p>
+     *
+     * @return <p>The item type used for book pricing</p>
+     */
     public static Material getBookPriceType() {
         return bookPriceType;
     }