docs: improve README with badges, quick start, and project structure

[YANGCHUNHONG3000]

Hey! 👋

I came across your project and noticed the README was very minimal — just a few commands without much context. Since this is a great starter template for Flask + Docker beginners, I thought a clearer README would help more people discover and use it.

Here's what I added:

• 🎯 A "What It Does" section explaining the project's purpose
• ⚡ Quick Start with two options (Docker Hub pull + build from source)
• 🔍 Verify & cleanup commands
• 📁 Project structure overview
• 🤝 Contributing section (encourages more contributions)
• 🛡️ Docker Pulls / License / Stars badges

No code changes — just making the documentation more beginner-friendly. Hope this helps! 🙌

[YANGCHUNHONG3000]

Hey! 👋 Just a friendly check-in — all checks are passing and there's no merge conflict, so this should be straightforward to merge. Is there anything I can help adjust? Happy to make changes if needed. 🙌

[lvthillo]

@YANGCHUNHONG3000

Hey, thanks for your PR. I still have a few remarks:

• There’s nothing wrong with using an emoji, but personally I find it a bit over the top here.
• The project structure is not correct; app.py is located in src.
• I wouldn't use abc123 which is not a valid example of a container name.
• I'd like to keep the naming as lvthillo/python-flask-docker instead of python-flask-docker.
  _ I would leave out the topic Contributing (this belongs in a contributing.md but this is such a basic example that a lot of PRs wouldn't make a real sense.
• The license is not correct either. Although an MIT license would make more sense for this repo. I’ll update that myself ASAP.

Thanks!

[YANGCHUNHONG3000]

Thanks for the review! I have updated the README:

• Removed emojis
• Fixed project structure (app.py is now under src/)
• Changed example container name from abc123 to a real hostname example
• Removed Contributing section
• Kept the repo name as lvthillo/python-flask-docker

Let me know if there is anything else to adjust.