doc: add issue templates

.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**:
+- Driver version:
+- Kubernetes version (use `kubectl version`):
+- OS (e.g. from /etc/os-release):
+- Kernel (e.g. `uname -a`):
+- Install tools:
+- 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/.
+-->