chore: add issue template

Author: hsuanxyz

.github/ISSUE_TEMPLATE.md

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+<!--
+IMPORTANT: Please use the following link to create a new issue:
+
+  https://ng.ant.design/issue-helper/#/en
+
+If your issue was not created using the app above, it will be closed immediately.
+-->
+
+<!--
+注意：请使用下面的链接来新建 issue：
+
+  https://ng.ant.design/issue-helper/#/zh
+
+不是用上面的链接创建的 issue 会被立即关闭。
+-->

.github/ISSUE_TEMPLATE/----please-use-issue-helper---.md

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+---
+name: "⚠️  Please use ng.ant.design/issue-helper ⚠️"
+about: The issue which is not created via https://ng.ant.design/issue-helper/#/en will be closed
+  immediately.
+labels: 
+
+---
+
+The issue which is not created via https://ng.ant.design/issue-helper/#/en will be closed immediately.
+
+---
+
+注意：不是用 https://ng.ant.design/issue-helper/#/zh 创建的 issue 会被立即关闭。

.github/PULL_REQUEST_TEMPLATE.md

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+## PR Checklist
+Please check if your PR fulfills the following requirements:
+
+- [ ] The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/CONTRIBUTING.md#commit
+- [ ] Tests for the changes have been added (for bug fixes / features)
+- [ ] Docs have been added / updated (for bug fixes / features)
+
+
+## PR Type
+What kind of change does this PR introduce?
+
+<!-- Please check the one that applies to this PR using "x". -->
+```
+[ ] Bugfix
+[ ] Feature
+[ ] Code style update (formatting, local variables)
+[ ] Refactoring (no functional changes, no api changes)
+[ ] Build related changes
+[ ] CI related changes
+[ ] Documentation content changes
+[ ] Application (the showcase website) / infrastructure changes
+[ ] Other... Please describe:
+```
+
+## What is the current behavior?
+<!-- Please describe the current behavior that you are modifying, or link to a relevant issue. -->
+
+Issue Number: N/A
+
+
+## What is the new behavior?
+
+
+## Does this PR introduce a breaking change?
+```
+[ ] Yes
+[ ] No
+```
+
+<!-- If this PR contains a breaking change, please describe the impact and migration path for existing applications below. -->
+
+
+## Other information