Add acoustics monitoring

I do not know if I'm doing the right thing. I tried to upload the script "acoustic.py" and I am asked to send a merge request. Is this the correct procedure? @tgal Thank you

scripts/acoustics.py

+#!/usr/bin/env python
+# coding=utf-8
+"""
+Online Acoustic Monitoring
+
+Usage:
+    acoustics.py [options]
+    acoustics.py (-h | --help)
+
+Options:
+    -d DET_ID       Detector ID 
+    -o PLOT_DIR     The directory to save the plot 
+    -h --help       Show this screen.
+
+"""
 import numpy as np
 import matplotlib.pyplot as plt
 import matplotlib
@@ -10,7 +25,7 @@ import argparse
 
 parser = argparse.ArgumentParser(description='Online_monitoring')
 parser.add_argument('-d', dest='det_id', type=str, nargs=1, required=True,
-                    help='The detector ID (e.g. D0ARCA001)')
+                    help='The detector ID (e.g. D_ORCA005)')
 parser.add_argument('-o', dest='plot_dir', type=str, nargs=1, required=True,
                     help='Directory in which the plot is saved')
 
@@ -22,7 +37,6 @@ def diff(first, second):
     second = set(second)
     return [item for item in first if item not in second]
 
-#detid='D_ORCA005'
 #print(time.time())
 
 db = kp.db.DBManager()