Kubernetes feature tracking issue template

ISSUE_TEMPLATE.md

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+Thanks for wanting to add a feature to Kubernetes!  You will be responsible for guiding
+your feature through completion, and asking the right people for approvals.  
+
+Large features typically go through three stages: [Alpha, Beta, and Stable](https://github.com/kubernetes/kubernetes/blob/master/docs/api.md#api-versioning)
+Each stage requires various approvals from various teams.
+
+You can use the checkboxes below to
+track your progress.  You can delete the text above once you have read it.  Please keep the checklist.
+
+- [ ] Before Alpha
+    - [ ] Design Approval
+      - [ ] < 1 page PR description of the design. [advice for design description]  **PR-NUMBER**
+      - [ ] Design doc under [docs/proposals](https://github.com/kubernetes/kubernetes/docs/proposals).  **PR-NUMBER**
+      - [ ] Initial API review (if API).  Maybe same PR as design doc. **PR-NUMBER**
+        -  Any code that changes an API (`/pkg/apis/...`)
+        -  **cc @kubernetes/api**
+    - [ ] Write (code + tests + docs) then get them merged.  **ALL-PR-NUMBERS**
+      - [ ] **Code needs to be disabled by default.**   Verified by code OWNERS
+      - [ ] Minimal testing
+      - [ ] Minimal docs
+        - cc @kubernetes/docs on docs PR
+        - **cc @kubernetes/feature-reviewers on this issue** to get approval before checking this off
+        - New apis: *Glossary Section Item* in the docs repo: kubernetes/kubernetes.github.io
+      - [ ] Update release notes
+- [ ] Before Beta
+  - [ ] Testing is sufficient for beta
+  - [ ] User docs with tutorials
+        - *Updated walkthrough / tutorial* in the docs repo: kubernetes/kubernetes.github.io
+        - cc @kubernetes/docs on docs PR
+        - **cc @kubernetes/feature-reviewers on this issue** to get approval before checking this off
+  - [ ] Thorough API review
+    - **cc @kubernetes/api**
+- [ ] Before Stable
+  - [ ] docs/proposals/foo.md moved to docs/design/foo.md 
+        - **cc @kubernetes/feature-reviewers on this issue** to get approval before checking this off
+  - [ ] Soak, load testing 			
+  - [ ] detailed user docs and examples
+    - **cc @kubernetes/docs**
+    - **cc @kubernetes/feature-reviewers on this issue** to get approval before checking this off
+
+*FEATURE_STATUS is used for feature tracking and to be updated by @kubernetes/feature-reviewers.*
+**FEATURE_STATUS: IN_DEVELOPMENT**
+
+More advice:
+
+Design
+   - Once you get LGTM from a *@kubernetes/feature-reviewers* member, you can check this checkbox, and the reviewer will apply the "design-complete" label.
+
+Coding
+  - Use as many PRs as you need.  Write tests in the same or different PRs, as is convenient for you.
+  - As each PR is merged, add a comment to this issue referencing the PRs.  Code goes in the https://github.com/kubernetes/kubernetes repository,
+        and sometimes https://github.com/kubernetes/contrib, or other repos.
+  - When you are done with the code, apply the "code-complete" label.
+  - When the feature has user docs, please add a comment mentioning @kubernetes/feature-reviewers and they will
+        check that the code matches the proposed feature and design, and that everything is done, and that there is adequate
+        testing.  They won't do detailed code review: that already happened when your PRs were reviewed.
+        When that is done, you can check this box and the reviewer will apply the "code-complete" label.
+
+Docs
+  - [ ] Write user docs and get them merged in.
+  - User docs go into https://github.com/kubernetes/kubernetes.github.io.
+  - When the feature has user docs, please add a comment mentioning @kubernetes/docs.
+  - When you get LGTM, you can check this checkbox, and the reviewer will apply the "docs-complete" label.
+