add issue templates

Author: desimone

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Let us know about a bug!
+---
+
+## What happened?
+
+## What did you expect to happen?
+
+## How'd it happen?
+
+1. Ran `x`
+2. Clicked `y`
+3. Saw error `z`
+
+## What's your environment like?
+
+- Pomerium version (retrieve with `pomerium --version`):
+- Server Operating System/Architecture/Cloud:
+
+## What's your config.yaml?
+
+```config.yaml
+# Paste your configs here
+# Be sure to scrub any sensitive values
+```
+
+## What did you see in the logs?
+
+```logs
+# Paste your logs here.
+# Be sure to scrub any sensitive values
+```
+
+## Additional context
+
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest something!
+---
+
+**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**
+
+**Describe alternatives you've considered**
+
+**Explain any additional use-cases**
+
+If there are any use-cases that would help us understand the use/need/value please share them as they can help us decide on acceptance and prioritization.
+
+**Additional context**
+
+Add any other context or screenshots about the feature request here.