add record start time at log.txt

main.py

 def sshConnect(cs, sd):
     cs = cs
     sd = sd
+    filepath = './log.txt'
+
     ssh = paramiko.SSHClient()
     ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
     ssh.connect(settings[4],port= settings[3], username=settings[5], password=settings[6])
     stdin, stdout, stderr = ssh.exec_command('mkdir ' + data_root_dir)
     #TODO: 여기에 도커 명령어 및 동시 녹화 코드 입력
     stdin, stdout, stderr = ssh.exec_command('docker run --rm --name mail_recorder --gpus 1 --privileged -v /dev:/dev -v /home/mc365/sources:/sources -v /home/mc365/data/'+cs+sd+':/data/'+cs+sd+' stereolabs/zed:3.5-gl-devel-cuda11.1-ubuntu18.04 python3 /sources/recorder.py')
+    f = open(filepath, 'w')
+    r_time = time.ctime(time.time())
+    f.write('record succesfully started at ' + str(r_time) + '\n')
+    f.close()
+
 
 
 def sshQuit(cs, sd):
     filepath = './log.txt'
     data_root_dir = './data/'+cs+sd
 
-    f = open(filepath, 'w')
-    f.write('record succesfully stopped')
+    f = open(filepath, 'a')
+    r_time = time.ctime(time.time())
+    f.write('record succesfully stopped at ' + str(r_time))
     f.close()