added issue templates for spec

[krishchow]

• This PR adds issue templates for the COSI spec - this will be vital as this project progresses so we have a solid framework for tracking issues and requests

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[xing-yang]

Can you squash your commits?

[krishchow]

Squashed them into 1 commit @xing-yang

[wlan0]

/lgtm

[xing-yang]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: krishchow, xing-yang

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