update readme

Signed-off-by: rahul <[email protected]>

Author: rcsofttech85

README.md

@@ -79,6 +79,17 @@ $data[0] = [
 
 ```
 
+**converting file to a json format**
+
+```
+$fileHandler = new FileHandler();
+$this->fileHandler->open(filename: 'movie.csv')->toJson();
+
+//output
+[{"Film":"Zack and Miri Make a Porno","Genre":"Romance","Lead Studio":"The Weinstein Company","Audience score %":"70","Profitability":"1.747541667","Rotten Tomatoes %":"64","Worldwide Gross":"$41.94 ","Year":"2008"},{"Film":"Youth in Revolt","Genre":"Comedy","Lead Studio":"The Weinstein Company","Audience score %":"52","Profitability":"1.09","Rotten Tomatoes %":"68","Worldwide Gross":"$19.62 ","Year":"2010"},{"Film":"Twilight","Genre":"Romance","Lead Studio":"Independent","Audience score %":"68","Profitability":"6.383363636","Rotten Tomatoes %":"26","Worldwide Gross":"$702.17 ","Year":"2011"}]
+
+```
+
 **Encrypt a file**
 
 ```