Added docker deployment code

[paynwahs]

AUTHOR(S)

Yap Yu Xiang Shawn, Malthus Oh Teng Jie

SPRINT AND STORY

Sprint 5 - PROJ-503

DESCRIPTION

Added Dockerfile which creates the image for the qbnb web application and docker-compose sets up and connects all services together

TESTING

Ran "docker-compose up" and visited the website successfully.
Ran pytest and flake8 which return successful results.

CHECKLIST:

Please ensure that your changes/pull request meet the following requirements before submitting:

• If submitting python code, my code follows the PEP8 style guidelines
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings or errors
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Parts of this document were taken from the following example template:

https://embeddedartistry.com/blog/2017/08/04/a-github-pull-request-template-for-your-projects/

[AdtSri413]

Looks good!