Added Dockerfile

[magicalyak]

This PR adds a dockerfile so you can run the following and see the app on Docker (replace magicalyak with your dockerhub name)
docker build --rm -t magicalyak/angular7-example-app .
docker run --rm -d -p 80:80/tcp magicalyak/angular7-example-app

[coveralls]

Pull Request Test Coverage Report for Build 644

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 87.94%

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Totals
Change from base Build 642:	0.0%
Covered Lines:	326
Relevant Lines:	366

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💛 - Coveralls

[Ismaestro]

Thanks very much @magicalyak!

[magicalyak]

Thank you! I was looking for a good demo website and your creation is great! The container was fun to build. It uses one image to build everything and the final container is just the site (so it’s pretty lightweight) thanks again!!