Updated Useful import scripts (markdown)

Useful-import-scripts.md

@@ -141,3 +141,39 @@ if __name__ == '__main__':
             weight = entry['weight']['weight'] / 1000
             writer.writerow({'dateTime': timestamp, 'weight': weight})
 ```
+
+## Google Fit Takeout --> openScale CSV file
+
+by sainigma see https://github.com/oliexdev/openScale/issues/1040
+
+```python
+#!/usr/bin/env python
+import csv
+from dateutil.parser import parse
+
+with open('Daily activity metrics.csv', newline='') as input_csv:
+  csv_reader = csv.reader(input_csv, delimiter=',')
+
+  rows = []
+
+  for row in csv_reader:
+    rows.append(row)
+  
+  headers = rows[0]
+  data = rows[1:]
+
+  date_idx = headers.index('Date')
+  weight_idx = headers.index('Average weight (kg)')
+
+  with open('openscale_data.csv', 'w', newline='', encoding='utf-8') as output_csv:
+    output_writer = csv.writer(output_csv, delimiter=',')
+
+    output_writer.writerow(["dateTime", "weight"])
+
+    for fragment in data:
+      date = fragment[date_idx]
+      weight = fragment[weight_idx]
+
+      if (weight and date):
+        output_writer.writerow([parse(date).strftime('%d.%m.%Y 08:00'), round(float(weight), 2)])
+```