Added a parameter to allow nested IFs

Author: SuchiraD

README.md

@@ -161,6 +161,14 @@ const report = await createReport({
    * (Default: 1)
    */
   compressionLevel?: number;
+  /**
+   * Whether to allow nested IF commands within the same paragraph or table row.
+   * By default, the library throws an error when it detects an IF command
+   * nested within another IF command on the same line or table row.
+   * Set to true to skip this validation check.
+   * (Default: false)
+   */
+  allowNestedIf?: boolean;
 });
 ```