Added options (-howtouse and -credits), updated way to start app, and found fix to random options error (ex: -B)

[moonsdust]

In this PR, the CLI was updated so that it supports the following options:

• -howtouse: Explains how to use tool (To use this, run the following command: ./streetwhisperapp -howtouse (if with generated exe) or python streetwhisperapp -howtouse (if directly interacting with the script))
• -credits: Credits section (To use this, run the following command: ./streetwhisperapp -credits (if with generated exe) or python streetwhisperapp -credits (if directly interacting with the script))
• --help: Shows all the options available (To use this, run the following command: ./streetwhisperapp --help (if with generated exe) or python streetwhisperapp --help (if directly interacting with the script))

This will be added soon into #21 but in order to start the app, you no longer need to use the start command and instead just use the command ./streetwhisperapp (if running the generated exe) or python streetwhisperapp (if running the script).

If you are generating an executable file, to stop error messages from showing up during the translation/transcription process like "No such option: -B", etc., see #29.

[carmen-chau]

@moonsdust
Looks good Emily. I still have to test this with the EXE generation, but I figure potential problems arising from that deserves an issue + PR of its own.

Futhermore this may or may not trigger the -B error again in #29, hence the reason for a seperate PR if need be.

IMO I think it's ok to go ahead and merge for now, but feel free to not if you prefer