[Add] Design doc for CodeFlare SDK

[varshaprasad96]

This PR adds design documentation for CodeFlare SDK to the repository for reference in future.

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What changes have been made

Verification steps

Checks

• [ ] I've made sure the tests are passing.
• Testing Strategy
  • [ ] Unit tests
  • [ ] Manual tests
  • [X] Testing is not required for this change

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.11%. Comparing base (2e28f8a) to head (f2602fd). Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #703   +/-   ##
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  Coverage   94.11%   94.11%           
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  Files          36       36           
  Lines        2412     2412           
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  Hits         2270     2270           
  Misses        142      142           

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[Bobbins228]

Just need to resolve conflict and it lgtm

[varshaprasad96]

@Bobbins228 could you approve the PR if everything looks good? Thanks! :)

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Bobbins228, franciscojavierarceo

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