Add Easegress to marketplace

[LokiWager]

BACKGROUND

• Add information about the background and reason for the change.
  Easegress is a Cloud Native traffic orchestration system, and we would like to submit it to the marketplace.

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Changes

• List the changes that you made
  Following the Contributing guideline, we add
• stacks/easegress/deploy.sh
• stacks/easegress/uninstall.sh
• stacks/easegress/upgrade.sh
• stacks/easegress/values.yaml

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Checklist

• review the contributing doc with steps for both adding or updating your application (if applicable)

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Reviewer: @marketplace-eng

[mbeyt]

I don't see any errors or issues with installing, so I'm approving and merging to let you move forward with creating a listing, but I'm also lacking any sort of Getting Started instructions, so I can't confirm the app itself works as expected. It would probably be helpful to include something post-install to direct to next steps; at the very least, the listing details should include a Getting Started section when you get to creating it.

[github-actions]

👋 @LokiWager
If this is an EXISTING Marketplace app, now that the PR is merged, all new users of your app will get the current version. You should visit the Vendor Portal to make sure you update any version numbers, Description, or Getting Started information that are related to the merged PR.
If this is a BRAND NEW Marketplace app, before this app update can go live on the Marketplace, please update and submit your app from the Vendor Portal.
Thanks!