Add github templates

.github/ISSUE_TEMPLATE.md

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+<!-- Thanks for filing an issue! Before hitting the button, please answer these questions.-->
+
+**Is this a request for help?** (If yes, you should use our troubleshooting guide and community support channels, see https://kubernetes.io/docs/tasks/debug-application-cluster/troubleshooting/.):
+
+**What keywords did you search in NGINX Ingress controller issues before filing this one?** (If you have found any duplicates, you should instead reply there.):
+
+---
+
+**Is this a BUG REPORT or FEATURE REQUEST?** (choose one):
+
+<!--
+If this is a BUG REPORT, please:
+  - Fill in as much of the template below as you can.  If you leave out
+    information, we can't help you as well.
+
+If this is a FEATURE REQUEST, please:
+  - Describe *in detail* the feature/behavior/change you'd like to see.
+
+In both cases, be ready for followup questions, and please respond in a timely
+manner.  If we can't reproduce a bug or think a feature already exists, we
+might close your issue.  If we're wrong, PLEASE feel free to reopen it and
+explain why.
+-->
+
+**Kubernetes version** (use `kubectl version`):
+
+**Environment**:
+
+- **Cloud provider or hardware configuration**:
+- **OS** (e.g. from /etc/os-release):
+- **Kernel** (e.g. `uname -a`):
+- **Install tools**:
+- **Others**:
+
+
+**What happened**:
+
+
+**What you expected to happen**:
+
+
+**How to reproduce it** (as minimally and precisely as possible):
+
+
+**Anything else we need to know**:

.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, read our contributor guidelines https://git.k8s.io/community/contributors/devel/pull-requests.md#the-pr-submit-process and developer guide https://git.k8s.io/community/contributors/devel/development.md#development-guide
+2. If you want *faster* PR reviews, read how: https://git.k8s.io/community/contributors/devel/pull-requests.md#best-practices-for-faster-reviews
+3. Follow the instructions for writing a release note: https://git.k8s.io/community/contributors/devel/pull-requests.md#write-release-notes-if-needed
+-->
+
+**What this PR does / why we need it**:
+
+**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
+
+**Special notes for your reviewer**: