API for uploading profile picture

[JanviMahajan14]

Problem Github Issue Number: #105 There is no API for handling the profile picture uploaded by the user

Solution of problem

I have added multer and sharp for supporting file uploads. Users can upload, update,delete,get their profile picture.

[codecov[bot]]

Codecov Report

Merging #107 into development will decrease coverage by 15.31%. The diff coverage is 28.94%.

@@               Coverage Diff                @@
##           development     #107       +/-   ##
================================================
- Coverage        73.44%   58.13%   -15.32%     
================================================
  Files               11       15        +4     
  Lines              177      332      +155     
  Branches            20       43       +23     
================================================
+ Hits               130      193       +63     
- Misses              41      118       +77     
- Partials             6       21       +15     

Impacted Files	Coverage Δ
app/models/User.js	83.60% <ø> (+5.82%)	:arrow_up:
app/controllers/user.js	20.00% <4.00%> (-20.75%)	:arrow_down:
app/middleware/avatar.js	50.00% <50.00%> (ø)
app/routes/user.js	100.00% <100.00%> (ø)
config/mongoose.js	75.00% <0.00%> (-25.00%)	:arrow_down:
app.js	79.06% <0.00%> (-4.27%)	:arrow_down:
app/routes/index.js	80.00% <0.00%> (-3.34%)	:arrow_down:
... and 5 more

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[devesh-verma]

@JanviMahajan14 this has been already done using multer.