Deployed the Application on Heroku and added Instruction guide with other files

[DARK-art108]

Description

Deploy the web app to Heroku, this will be helpful for testers.

Fixes #1135

Type of Change:

Delete irrelevant options.

• Code
• Documentation

Code/Quality Assurance Only

• This change requires a documentation update (software upgrade on readme file)
• New feature (non-breaking change which adds functionality pre-approved by mentors)

How Has This Been Tested?

The Heroku app is deployed on https://vms-r.herokuapp.com/ and tested

Checklist:

Delete irrelevant options.

• I have commented my code or provided relevant documentation, particularly in hard-to-understand areas

Code/Quality Assurance Only

• My changes generate no new warnings
• My PR currently breaks something (fix or feature that would cause existing functionality to not work as expected)
• 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 published in downstream modules

[DARK-art108]

Hello, @isabelcosta I have added the additional files which will be required to deploy the application to Heroku and made changes which you have suggested in the previous pr #1159.

You can close the previous PR #1159 and review this one for further changes to be done.

[codecov]

Codecov Report

Merging #1160 into develop will decrease coverage by 0.22%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1160      +/-   ##
===========================================
- Coverage    87.18%   86.96%   -0.23%     
===========================================
  Files           85       85              
  Lines         4057     4057              
  Branches       237      237              
===========================================
- Hits          3537     3528       -9     
- Misses         450      457       +7     
- Partials        70       72       +2     

Impacted Files	Coverage Δ
vms/event/views.py	78.05% <0.00%> (-1.27%)	⬇️
vms/shift/views.py	61.40% <0.00%> (-1.21%)	⬇️

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[haelmj]

@DARK-art108 Could you please verify that the app is still deployed on Heroku? Navigating to the URL you provided here, returns this error message: