Added the events CRUD functionality

[tanujvyas10]

Problem

Github Issue Number: #75

Type of Change

• [ ] Bug fix
• [x] New Feature
• [ ] Development of UI/UX prototypes
• [ ] Small refactor
• [ ] Change in Documentation

Checklist

• [x] My code follows the same style as the codebase
• [ ] My Code change requires a change in documentation
• [ ] I have updated the Readme accordingly
• [x] I made PR against development branch
• [ ] I have run the test cases locally and it's passing.
• [ ] I have squashed my commits

[codecov[bot]]

Codecov Report

Merging #92 into development will decrease coverage by 11.34%. The diff coverage is 18.98%.

@@               Coverage Diff                @@
##           development      #92       +/-   ##
================================================
- Coverage        59.92%   48.57%   -11.35%     
================================================
  Files               14       17        +3     
  Lines              252      352      +100     
  Branches            29       53       +24     
================================================
+ Hits               151      171       +20     
- Misses              86      142       +56     
- Partials            15       39       +24     

Impacted Files	Coverage Δ
app/models/Event.js	20.00% <0.00%> (ø)
app/controllers/event.js	3.22% <3.22%> (ø)
app.js	85.29% <100.00%> (+0.91%)	:arrow_up:
app/routes/event.js	100.00% <100.00%> (ø)

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