Add our Developer Experience Engineer career opportunity to the READM…

[mptap]

…E #721

Fixes #721

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:

• Add our Developer Experience Engineer career opportunity to the README Add our Developer Experience Engineer career opportunity to the README #721

If you have questions, please send an email to SendGrid, or file a GitHub Issue in this repository.

[codecov]

Codecov Report

Merging #724 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #724   +/-   ##
=======================================
  Coverage   85.04%   85.04%           
=======================================
  Files          35       35           
  Lines        1157     1157           
  Branches      172      172           
=======================================
  Hits          984      984           
  Misses         90       90           
  Partials       83       83

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[thinkingserious]

Duplicate of #722