Created First-timers.md File

[jaykay12]

Fixes #662

Checklist

• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the [Contribution Guide] and my PR follows them.
• I updated my branch with the master branch.
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation about the functionality in the appropriate .md file
• I have added in line documentation to the code I modified

Short description of what this PR does:

• Created Documentation for the First-time Contributors to ease their collaborations in a profound manner

[SendGridDX]

All committers have signed the CLA.

[thinkingserious]

Hello @jaykay12,

Thanks again for the PR!

It's HACKTOBERFEST! We want to show our appreciation by sending you some special Hacktoberfest swag. If you have not already, could you please fill out this form so we can send it to you? Thanks!

Team SendGrid DX

[thinkingserious]

Hello @jaykay12,

Could you please merge this against our v4 branch? Thank you!

With Best Regards,

Elmer

[codecov]

Codecov Report

Merging #666 into master will decrease coverage by 0.25%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #666      +/-   ##
==========================================
- Coverage   85.03%   84.77%   -0.26%     
==========================================
  Files          35       35              
  Lines        1156     1156              
  Branches      172      172              
==========================================
- Hits          983      980       -3     
  Misses         90       90              
- Partials       83       86       +3

Impacted Files	Coverage Δ
sendgrid/helpers/mail/spam_check.py	88.46% <0%> (-7.7%)	⬇️
sendgrid/helpers/inbound/config.py	93.93% <0%> (-3.04%)	⬇️

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[jaykay12]

@thinkingserious Done. Base branch changed to v4 👍

[thinkingserious]

Hello @jaykay12,

Thanks again for the PR!

We appreciate your contribution and look forward to continued collaboration. Thanks!

Team SendGrid DX