feat: update create flutter_app output text for clarity

[yaksh1]

Resolves #921

Updated CLI template output for
very_good create flutter_app my_app
for more clarity on hoe to open the project.

Created a Very Good App! 🦄

In order to open your project, type:
       $ cd app_name
       $ code .
+----------------------------------------------------+
| Looking for more features?                         |
| We have an enterprise-grade solution for companies |
| called Very Good Start.                            |
|                                                    |
| For more info visit:                               |
| https://verygood.ventures/solution/very-good-start |
+----------------------------------------------------+

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore

[alestiago]

LGTM.

I made some amendments to ensure the paths are not using a platform specific separator and included some tests.

This is the output I'm seeing:

[yaksh1]

@alestiago Thank you for these amendments, It was fun working on this. Also, I have some ideas for very_good_cli, if we could discuss it, I would really appreciate it.

[alestiago]

Hi @yaksh1 ! I'm glad you enjoyed working on this. If you have some enhancement ideas for the tool feel free to open an issue for each one of them and we can discuss it there 🙌