Adds dev container and updates docs with Codespaces information

[samruddhikhandale]

Reference: #13806

You can test these changes with Codespaces by simply clicking on the Code icon on top right side of this PR ☝️

Release Note

NONE

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: samruddhikhandale / name: Samruddhi Khandale (3be4321)

[knative-prow]

Welcome @samruddhikhandale! It looks like this is your first PR to knative/serving 🎉

[knative-prow]

Hi @samruddhikhandale. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[dprotaso]

/ok-to-test

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (ef53449) 86.29% compared to head (ac6ed11) 86.29%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13838   +/-   ##
=======================================
  Coverage   86.29%   86.29%           
=======================================
  Files         198      198           
  Lines       14669    14669           
=======================================
  Hits        12659    12659           
+ Misses       1713     1712    -1     
- Partials      297      298    +1     

see 2 files with indirect coverage changes

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[dprotaso]

Looks good - just one last minor thing

#13838 (comment)

[dprotaso]

great thanks for the help!

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, samruddhikhandale

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