Created Troubleshooting (markdown)

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## Error opening file in read/write mode
If you encounter issues such as:
```
Error opening '/path/to/file' in read/write mode
```
increase `nofile` value in the file `/etc/security/limits.conf`:
``` /etc/security/limits.conf
#<domain> <type> <item> <value>
btracker soft nofile 2048
btracker hard nofile 524288
```
* for systemd, use the following [example](https://github.com/YGGverse/aquatic-crawler/wiki/Systemd)