Added Javadoc and instructions for contribution

src/main/java/org/cametendo/YesNo.java

@@ -1,5 +1,25 @@
 package org.cametendo;
+
+/**
+ * Utility class for parsing yes/no user responses.
+ * 
+ * <p>This class provides a simple method to interpret user input as a boolean
+ * value, accepting various forms of "yes" and treating everything else as "no".</p>
+ * 
+ * @author Cametendo
+ * @version 1.0
+ */
 public class YesNo {
+    
+    /**
+     * Parses user input to determine if it represents a "yes" response.
+     * 
+     * <p>Accepts "Y", "y", and empty string (default) as yes responses.
+     * All other inputs are treated as no responses.</p>
+     * 
+     * @param input User input string to parse
+     * @return true if the input represents a yes response, false otherwise
+     */
     public static boolean check(String input) {
         switch (input) {
             case "Y":