Add GPU edge node manege docs

[wbc6080]

• Please check if the PR fulfills these requirements

• [x] The commit message follows our guidelines
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

Which issue(s) this PR fixes:

Fixes #

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

docs update

• What is the new behavior (if this is a feature change)?

Added documentation for managing edge GPU nodes and introduce how to use GPU resources in edge applications.

[kubeedge-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[tangming1996]

/lgtm

[kubeedge-bot]

New changes are detected. LGTM label has been removed.

[wbc6080]

PTAL @fisherxu @Shelley-BaoYue

[stale[bot]]

Is this still relevant? If so, what is blocking it? Is there anything you can do to help move it forward?

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.