Add bug and feature templates

Author: Kate Osborn

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Deploy x to '...' using some.yaml
+2. View logs on '....'
+3. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Your environment**
+* Version of the NGINX Kubernetes Gateway - release version or a specific commit. The first line of the nginx-gateway container logs includes the commit info.
+* Version of Kubernetes
+* Kubernetes platform (e.g. Mini-kube or GCP)
+* Details on how you expose the NGINX Gateway Pod (e.g. Service of type LoadBalancer or port-forward)
+* Logs of NGINX container: `kubectl -n nginx-gateway logs -l app=nginx-gateway -c nginx`
+* NGINX Configuration: `kubectl -n nginx-gateway exec <gateway-pod> -c nginx -- nginx -T` 
+
+**Additional context**
+Add any other context about the problem here. Any log files you want to share.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: 'proposal'
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+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.