[kubeflow 1.8] docs: add 1.8 release timeline (#621)

* docs: add 1.8 release timeline

* docs: update based on comments

* docs: update release timeline table, meeting notes link and others

releases/release-1.8/README.md

@@ -0,0 +1,53 @@
+# Kubeflow 1.8
+
+### Links
+
+- [Release Team](release-team.md)
+- Calendar TBD
+- [Meeting Notes](https://bit.ly/kf-release-team-notes)
+- Recordings TBD
+- [Project Board (Private)](https://github.com/orgs/kubeflow/projects/58)
+- Contact
+  - [#release](https://app.slack.com/client/T7QLHSH6U/C9V2WT2KV) on slack
+  - [@release-team](https://github.com/orgs/kubeflow/teams/release-team) on GitHub
+
+### TL;DR
+
+The 1.8 release cycle is proposed as follows
+
+- **Monday, May 1st 2023**      : Week 0  C\* - Release team is formed
+- **Wednesday, May 10th 2023**  : Week 1  C\* - Release cycle begins
+- **Monday, May 15th 2023**     : Week 2      - Roadmaps are finalised
+- **Wednesday, Aug 2nd 2023**   : Week 13 C\* - Feature freeze, manifests sync starts, docs update starts
+- **Wednesday, Aug 9th 2023**   : Week 14     - Manifests sync ends, manifests testing and bug fixing starts
+- **Wednesday, Aug 23rd 2023**  : Week 16     - Manifests testing and bug fixing ends, RC.0 is cut, distribution testing starts
+- **Wednesday, Sept 13th 2023** : Week 19 C\* - Distribution testing ends, pre-release bug fixing stage starts
+- **Wednesday, Sept 27th 2023** : Week 21 C\* - Pre-release bug fixing stage ends
+- **Tuesday, Oct 3rd 2023**     : Week 22     - Docs update ends
+- **Wednesday, Oct 4th 2023**   : Week 22     - Kubeflow v1.8 Released
+
+>C\*: this week coincides with the Community Meeting
+
+## Timeline
+
+TODO: upon agreement on the dates above
+| **When** | **Week** | **Who** | **What** |
+| -------- | -------- | ------- | -------- |
+| Mon May 1st 2023 | Week 0 | Release manager | [Preparation](../handbook.md#preparation) |
+| Wed May 10th 2023 | Week 1 | Release manager | Start of Release Cycle |
+| Wed May 10th 2023 | Week 1 | Community | [Development](../handbook.md#development-10-weeks) |
+| Wed Aug 2nd 2023 | Week 13 | Release team | [Feature Freeze](../handbook.md#feature-freeze-2-weeks) |
+| Wed Aug 2nd 2023 | Week 13 | Release manager, WG leads | Manifests sync starts |
+| Wed Aug 2nd 2023 | Week 13 | Docs lead | Docs update starts |
+| Wed Aug 9th 2023 | Week 14 | Release manager, WG leads | Manifests sync ends |
+| Wed Aug 9th 2023 | Week 14 | Manifests WG | Manifests testing and bug fixing starts |
+| Wed Aug 23rd 2023| Week 16 | Manifests WG | Manifests testing and bug fixing ends |
+| Wed Aug 23rd 2023 | Week 16 | Release manager | [v1.8-rc.0 Released](../handbook.md#feature-freeze-2-weeks) |
+| Wed Aug 23rd 2023 | Week 16 | Distributions | Distribution testing starts |
+| Wed Sept 13th 2023 | Week 19 | Distributions | Distribution testing ends |
+| Wed Sept 13th 2023 | Week 19 | WGs | Pre-release bug fixing stage starts |
+| Wed Sept 27th 2023 | Week 21 | WGs | Pre-release bug fixing stage ends |
+| Wed Oct 3rd 2023 | Week 22 | Docs lead | Docs update ends |
+| Wed Oct 4th 2023 | Week 22 | Release team | **v1.8** Release day |
+| Wed Oct 4th 2023 | Week 22 | Release team, Docs lead | Publish release blog |
+| Mon Oct 9th 2023 | Week 23 | Release team | Release retrospective |