feat: list example files in new command help message

[AnishKacham]

Description

• Give a list of available example files present in assets/examples folder
  in the new help command.
• Add example usage for the new help command

Behaviour:

$ ./bin/run new --help
Creates a new asyncapi file

USAGE
  $ asyncapi new [-h] [-n <value>] [-e <value>] [-s] [-p <value>] [--no-tty]

FLAGS
  -e, --example=<value>
      name of the example to use. Available examples are:
        - simple.yml
        - anyof.yml
        - application-headers.yml
        - correlation-id.yml
        - websocket-gemini.yml
        - gitter-streaming.yml
        - mercure.yml
        - not.yml
        - operation-security.yml
        - oneof.yml
        - rpc-client.yml
        - rpc-server.yml
        - slack-rtm.yml
        - tutorial.yml
        - streetlights-kafka.yml
        - streetlights-operation-security.yml
        - streetlights-mqtt.yml

  -h, --help
      Show CLI help.

  -n, --file-name=<value>
      name of the file

  -p, --port=<value>
      port in which to start Studio

  -s, --studio
      open in Studio

  --no-tty
      do not use an interactive terminal

DESCRIPTION
  Creates a new asyncapi file

EXAMPLES
  $ asyncapi new         - start creation of a file in interactive mode

  $ asyncapi new --file-name=my-asyncapi.yml --example=default-example.yml --no-tty      - create a new file with a specific name, using one of the examples and without interactive mode

COMMANDS
  new file     Creates a new asyncapi file
  new glee     Creates a new Glee project
  new project  Creates a new Glee project

Related issue(s)
Fixes #162

[AnishKacham]

@Souvikns @derberg Could you please review this one final time?

[Souvikns]

@AnishKacham can you check if you have some lint issues?

[AnishKacham]

@Souvikns fixed them :3

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[Souvikns]

LGTM 🚀

[AnishKacham]

/rtm

[asyncapi-bot]

🎉 This PR is included in version 0.54.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀