added an example using the library

example.py

@@ -0,0 +1,19 @@
+#!/usr/bin/python3
+
+from finviz.helper_functions.save_data import export_to_db, export_to_csv
+from finviz.screener import Screener
+from finviz.main_func import *
+
+#filters = []
+#filters = ['geo_usa']
+filters = ['idx_sp500']  # Shows companies in the S&P500
+print("Filtering stocks..")
+stock_list = Screener(filters=filters, order='ticker')
+print("Parsing every stock..")
+stock_list.get_ticker_details()
+
+# Export the screener results to CSV file
+stock_list.to_csv('sp500.csv')
+
+# Create a SQLite database
+#stock_list.to_sqlite('sp500.sqlite')