Add doc folder

doc/demo.py

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+from waternsw_grabber import telemetered_bore_downloader, extract_records
+
+download_dir = 'downloads'
+output_dir = 'csv'
+start_date = '1900-01-01'
+end_date = '2019-02-14'
+bore_ids = [
+    'GW039102.1.1',
+    'GW039114.1.1',
+    'GW039117.1.1',
+]
+
+# Download bore records
+telemetered_bore_downloader(bore_ids, start_date, end_date, download_dir)
+
+# Extract zip archives
+extract_records(download_dir, output_dir, clean_up=False)