Adding codecov scripts

[AnkurAnand11]

Change log description
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Purpose of the change
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What the code does
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[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (5b0176a) 97.42% compared to head (25974b5) 86.02%.

Files	Patch %	Lines
src/stream_writer.rs	0.00%	1 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@             Coverage Diff             @@
##           master       #3       +/-   ##
===========================================
- Coverage   97.42%   86.02%   -11.40%     
===========================================
  Files           2        8        +6     
  Lines         349      880      +531     
===========================================
+ Hits          340      757      +417     
- Misses          9      123      +114     

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