Created Troubleshooting (markdown)

Troubleshooting.md

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+# General
+
+### I can't find my Token
+The instructions to find your Token are [here](https://github.com/Tyrrrz/DiscordChatExporter/wiki/Obtaining-Token-and-Channel-IDs).
+
+### Where is Channel ID?
+The instructions to find a Channel ID are [here](https://github.com/Tyrrrz/DiscordChatExporter/wiki/Obtaining-Token-and-Channel-IDs).
+
+### How do I use the CLI?
+Just run the CLI without parameters, it should output the usage instructions.
+
+### Option '-b' parse error: could not parse '\<BOTTOKEN>' to 'System.Boolean'
+`-b` does not require a value, it just tells that the token is a bot token.
+The correct usage is:
+
+`DiscordChatExporter.Cli.exe -t <BOTTOKEN> -b -c <CHANNEL>`
+
+# Linux
+
+### Unhandled Exception
+```
+Unhandled Exception:
+System.MissingMethodException: Method 'System.Net.Logging.get_Http' not found.
+...
+```
+Make sure you've installed Mono correctly. The instructions are available [here](https://github.com/Tyrrrz/DiscordChatExporter/wiki/Linux-usage-instructions) and also on [Mono's Official Documentation](https://www.mono-project.com/download/stable/#download-lin).
+
+### Username is not in the sudoers file. This incident will be reported
+Run `su` on Terminal, then `adduser USER sudo`, replacing `USER` with your username. Reboot.
+
+
+# macOS
+
+### Mono command not found
+If you're trying to execute mono within a script, make sure you include its path. 
+
+Adding `PATH=/Library/Frameworks/Mono.framework/Versions/Current/bin/:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin` before the mono command should solve this.
+
+***
+
+If you weren't able to find a solution here, please [open a new issue](https://github.com/Tyrrrz/DiscordChatExporter/issues/new).