feat: add README and useful bash scripts

README.md

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+## Useful scripts
+
+This repository contains different bash scripts and commands for reolink camera.
+
+## download.sh
+
+This script uses `ffmpeg` to download via RTSP the video and audio from your camera saving it in the MP4 format, the name will start with the `date` of the day (ex. `2022-08-26--22-00-00-capture-0000.mp4`) and a file will be recorded and saved every `$TIME` seconds.  
+The name of the files starts with a date to make it easier the management of the files, like removing easily all the records of a specific month, day or year.
+
+### Why ffmpeg?
+
+I tried **openRTSP** ❌ but half of the video in the MP4 format is without audio and I don't know why.
+
+example:
+
+```
+openRTSP -D 1 -c -B 10000000 -b 10000000 -q -Q -F cam_eight -d 28800 -P 10 -t rtsp://"admin":"mypassword"@192.168.0.176:554
+```
+
+source of command and explanation: https://superuser.com/questions/766437/capture-rtsp-stream-from-ip-camera-and-store
+
+I tried **VLC** ❌ but I got some issues saving the files with the audio and managing it.
+
+example command:
+
+```
+cvlc rtsp://admin:password@192.168.0.176:554//h264Preview_01_main --sout=file/ts:mystream.mpg
+```
+
+FFmpeg was the best, so I chose it. ✅
+
+## clean_record.sh
+
+This script deletes all the records inside a `tmp` directory of the previous month.

clean_records.sh

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+LAST_MONTH=$(date --date='-1 month' +'%Y-%m')
+rm "tmp/$LAST_MONTH-"*

download.sh

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+USERNAME="admin"
+PASSWORD="mypassword"
+TIME=60 # seconds
+IP="192.168.1.197"
+PORT=554
+
+ffmpeg -i rtsp://$USERNAME:$PASSWORD@$IP:$PORT/h264Preview_01_main \
+       -c copy \
+       -map 0 \
+       -reset_timestamps 1 \
+       -f segment \
+       -segment_time $TIME \
+       -strftime 1 \
+       -segment_format mp4 \
+       "%Y-%m-%d--%H-%M-%S--capture-%04d.mp4"
+