add linesOffset to README.md

Author: orevron

README.md

@@ -1,3 +1,4 @@
+
 <p align="center">
   <img src='https://i.ibb.co/DKrGhVQ/Frame-1-1.png' width="100%" alt='React Diff Viewer' />
 </p>
@@ -78,6 +79,7 @@ class Diff extends PureComponent {
 | useDarkTheme              | `boolean`       | `true`                         | To enable/disable dark theme.                                                                                                                                                                                                                                                                                                                                                                                    |
 | leftTitle                 | `string`        | `undefined`                    | Column title for left section of the diff in split view. This will be used as the only title in inline view.                                                                                                                                                                                                                                                                                                     |
 | rightTitle                | `string`        | `undefined`                    | Column title for right section of the diff in split view. This will be ignored in inline view.                                                                                                                                                                                                                                                                                                                   |
+| linesOffset               | `number`        | `0`                            | Number to start count code lines from.                                                                                                                                                                                                                                                                                                                                                                           |
 
 ## Instance Methods