Adding example how to export only specific worksheets

Readme.md

@@ -4,11 +4,26 @@ This script will help you to extract Worksheets from an Excel file. It already s
 
 ## Run the example
 
-Clone this repository and try to run the example
-
+Clone this repository and try to run the example file. The file has 3 worksheets: `Worksheet 1`, `Another data set` and `Last`
+ 
 1. `git clone [email protected]:zauberware/excel-worksheets-to-csv.git && cd excel-worksheets-to-csv`
 2. `python worksheet_to_csv.py example.xlsx`
-3. See results under `exports/`
+
+Now you should see `Worksheet 1.csv`, `Another data set.csv` and `Last.csv` in the exports folder.
+
+
+## Export all Worksheets
+
+To export all worksheets to CSV run `python worksheet_to_csv.py example.xlsx` like in the example.
+
+
+## Export specific Worksheets
+
+To export only specific worksheets you can specify them comma seperated as the second argument of the script.
+
+**Example: Export only `Worksheet 1` and `Last`:**
+
+`python worksheet_to_csv.py example.xlsx "Worksheet 1,Last"`
 
 
 ## Prerequisites