feat: add --boilerplate flag to rc-apps create command

[dwakshar]

What does this PR do?

Adds a --boilerplate flag to the rc-apps create command that allows developers to automatically generate common starter templates when creating a new Rocket.Chat app.

Motivation

Currently, after running rc-apps create, developers have to manually write slash commands, API endpoints, and settings from scratch. This PR connects the existing templates in the repo to the create command, reducing boilerplate setup time especially for new contributors.

How to use

# Generate a single template
rc-apps create --name=MyApp --boilerplate slash-command

# Generate multiple templates
rc-apps create --name=MyApp --boilerplate slash-command --boilerplate settings

# All supported options
--boilerplate slash-command
--boilerplate api-endpoint
--boilerplate settings

Changes made

• Added --boilerplate flag (with multiple: true) to src/commands/create.ts
• Created src/misc/BoilerplateCreator.ts — handles template generation logic
• Exported BoilerplateCreator from src/misc/index.ts

Testing

Tested locally by running:

node bin/run create --name=TestApp --boilerplate slash-command

Confirmed SlashCommand.ts was generated inside the new app folder.

Screenshots

Related issue

Closes #181

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