Add new maintainer onboarding file

Signed-off-by: Benazir Khan <[email protected]>

Author: benazirk

new_maintainer_onboarding.md

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+Thank you for your contributions thus far. We are excited you are joining this enthusiastic team of Spin maintainers. We've created a checklist to get you onboarded as a maintainer of Spin. Many of these are steps advised by the CNCF for all individuals becoming maintainers of CNCF projects. This list will likely grow to include Spin specific tasks.
+
+Please make sure you review and understand the following documents:
+- [ ] The [Technical Leadership Principles](https://github.com/cncf/toc/blob/main/PRINCIPLES.md#technical-leadership-principles) that outlines the expected behavior for any maintainer in a leadership role.
+- [ ] The [project proposal process and requirements](https://github.com/cncf/toc/blob/main/process/README.md).
+- [ ] The [services available for your project at the CNCF](https://contribute.cncf.io/resources/project-services/).
+- [ ] The [dependency license allowlist](https://github.com/cncf/foundation/blob/main/allowed-third-party-license-policy.md#approved-licenses-for-allowlist).
+- [ ] The [online program guidelines](https://github.com/cncf/foundation/blob/main/online-programs-guidelines.md).
+- [ ] The [telemetry data collection and usage policy](https://www.linuxfoundation.org/legal/telemetry-data-policy).
+- [ ] Join the [#maintainers-circle](https://cloud-native.slack.com/archives/C014YQ8CDCG) Slack channel.
+- [ ] Create a PR to add yourself to https://github.com/cncf/foundation/tree/4d4456c6015e569bf3d341fbdd52c48edf547c57?tab=readme-ov-file#other-content as a spin maintainer.