feat: Add randomization of keystroke interval and mistake percentage …

…to typing simulation

docs/English/usage.html

@@ -19,6 +19,8 @@ <h1>How to Use Chainsaw Human Typing</h1>
                         <li><strong>Delay:</strong> Set the delay in seconds before starting the typing simulation.</li>
                         <li><strong>Interval:</strong> Set the interval between keystrokes. This determines how fast the typing simulation occurs.</li>
                         <li><strong>Chars per Stroke:</strong> Choose the number of characters to type at a time before pausing.</li>
+                        <li><strong>Randomize Interval:</strong> If checked, the application will randomize the interval between keystrokes to simulate human typing more accurately.</li>
+                        <li><strong>Mistake Percentage:</strong> Set the percentage of mistakes to introduce in the typing simulation. Mistakes include typos, backspaces, and corrections.</li>
                         <li><strong>Type Enter:</strong> If checked, the application will simulate pressing the Enter key when it encounters newline characters in the text.</li>
                     </ul>
                 </li>