doc: add issue and PR templates

Author: andyzhangx

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Create a report to help us improve this project
+
+---
+
+<!-- Please use this template while reporting a bug and provide as much info as possible. Not doing so may result in your bug not being addressed in a timely manner. Thanks!
+-->
+
+
+**What happened**:
+
+**What you expected to happen**:
+
+**How to reproduce it**:
+
+**Anything else we need to know?**:
+
+**Environment**:
+- CSI Spec version:
+- Kubernetes version (use `kubectl version`):
+- Others:

.github/ISSUE_TEMPLATE/enhancement.md

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+---
+name: Enhancement Request
+about: Suggest an idea for this project
+
+---
+
+
+**Is your feature request related to a problem?/Why is this needed**
+<!-- A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] -->
+
+**Describe the solution you'd like in detail**
+<!-- A clear and concise description of what you want to happen. -->
+
+**Describe alternatives you've considered**
+<!-- A clear and concise description of any alternative solutions or features you've considered. -->
+
+**Additional context**
+<!-- Add any other context or screenshots about the feature request here. -->

.github/ISSUE_TEMPLATE/support.md

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+---
+name: Support Request
+about: Ask questions about this project
+
+---
+
+<!-- 
+STOP -- PLEASE READ!
+
+GitHub is not the right place for support requests.
+
+If you're looking for help, post your question on the [Kubernetes Slack ](http://slack.k8s.io/) Sig-Storage Channel.
+
+If the matter is security related, please disclose it privately via https://kubernetes.io/security/.
+-->

.github/PULL_REQUEST_TEMPLATE.md

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+<!--  Thanks for sending a pull request!  Here are some tips for you:
+
+1. If this is your first time, please read our contributor guidelines: https://git.k8s.io/community/contributors/guide#your-first-contribution and developer guide https://git.k8s.io/community/contributors/devel/development.md#development-guide
+2. Follow the instructions for writing a release note: https://git.k8s.io/community/contributors/guide/release-notes.md
+3. If the PR is unfinished, see how to mark it: https://git.k8s.io/community/contributors/guide/pull-requests.md#marking-unfinished-pull-requests
+-->
+
+**What type of PR is this?**
+> Uncomment only one ` /kind <>` line, hit enter to put that in a new line, and remove leading whitespaces from that line:
+>
+> /kind api-change
+> /kind bug
+> /kind cleanup
+> /kind design
+> /kind documentation
+> /kind failing-test
+> /kind feature
+> /kind flake
+
+**What this PR does / why we need it**:
+
+**Which issue(s) this PR fixes**:
+<!--
+*Automatically closes linked issue when PR is merged.
+Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`.
+_If PR is about `failing-tests or flakes`, please post the related issues/tests in a comment and do not use `Fixes`_*
+-->
+Fixes #
+
+**Special notes for your reviewer**:
+
+**Does this PR introduce a user-facing change?**:
+<!--
+If no, just write "NONE" in the release-note block below.
+If yes, a release note is required:
+Enter your extended release note in the block below. If the PR requires additional action from users switching to the new release, include the string "action required".
+-->
+```release-note
+none
+```