docs: Add first timers file

[Varpie]

Fixes #99

Checklist

• [x] I have made a material change to the repo (functionality, testing, spelling, grammar)
• [x] I have read the [Contribution Guide] and my PR follows them.
• [x] I updated my branch with the master branch.
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] 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:

• Adding a file for first time contributors, containing documentation on how to contribute to the repository
• Contains a list of repositories with open, easy issues

[SendGridDX]

All committers have signed the CLA.

[codecov[bot]]

Codecov Report

Merging #101 into main will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #101   +/-   ##
=========================================
  Coverage     49.28%   49.28%           
  Complexity       38       38           
=========================================
  Files             5        5           
  Lines           211      211           
  Branches         16       16           
=========================================
  Hits            104      104           
  Misses          103      103           
  Partials          4        4           

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