release doc

[aniruddha2000]

How to categorize this PR?

/kind enhancement
/kind documentation

What this PR does / why we need it:

This PR adds documentation for the release process for the gardener-extension-provider-stackit. Explaining, major, minor and patch releases and using our release tool.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Breaking changes:

[ske-prow]

@aniruddha2000: The label(s) kind/documentation cannot be applied, because the repository doesn't have them.

Details

In response to this:

How to categorize this PR?

/kind enhancement
/kind documentation

What this PR does / why we need it:

This PR adds documentation for the release process for the gardener-extension-provider-stackit. Explaining, major, minor and patch releases and using our release tool.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Breaking changes:

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-sigs/prow repository.

[ske-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign xoxys for approval. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[aniruddha2000]

This PR is replacement PR for #74

[ske-prow]

@aniruddha2000: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-gardener-extension-provider-stackit-infra-integration-tests	6b2d813	link	true	/test pull-gardener-extension-provider-stackit-infra-integration-tests

Full PR test history. Your PR dashboard. Command help for this repository.
Please help us cut down on flakes by linking this test failure to an open flake report or filing a new flake report if you can't find an existing one. Also see the gardener testing guideline for how to avoid and hunt flakes.

Details

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-sigs/prow repository. I understand the commands that are listed here.