Add some issue templates (#120)

* Add some issue templates

Add some issue templates to which is being completed as part of #119

* Add enhancement label

Author: astoycos

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,34 @@
+---
+name: Bug Report
+about: Use this template to help report bugs
+title: "[BUG]"
+labels: kind/bug
+assignees: ''
+
+---
+
+<!--
+Thank you for your interest in Network Policy API! Please note that bug reports 
+here should only be used for bugs with the API itself, such as:
+
+- Incomplete or inaccurate validation
+- Problems with the API specification
+- Unexpected errors with the validating webhook
+- Flaws in conformance tests
+
+Bugs that don't fit into one of the above categories should likely be filed
+with the [implementation](https://network-policy-api.sigs.k8s.io/implementations/)
+of Network Policy API that you're using.
+
+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. Thank you!
+-->
+
+**What happened**:
+
+**What you expected to happen**:
+
+**How to reproduce it (as minimally and precisely as possible)**:
+
+**Anything else we need to know?**:

.github/ISSUE_TEMPLATE/conformance-test-updates.md

@@ -0,0 +1,16 @@
+---
+name: Conformance Test Updates
+about: Use this template for requesting updates to the upstream conformance tests
+title: "[CONFORMANCE]"
+labels: area/conformance
+assignees: ''
+
+---
+
+<!-- Please only use this template for submitting conformance test requests -->
+
+**What existing test case does this issue concern**:
+
+**What test case(s) would you like to be added**:
+
+**Why this is needed**:

.github/ISSUE_TEMPLATE/enhancement-proposal.md

@@ -0,0 +1,29 @@
+---
+name: Enhancement Proposal
+about: Use this template for submitting enhancement requests
+title: "[ENHANCEMENT]"
+labels: 'kind/enhancement'
+assignees: ''
+
+---
+
+<!-- Please only use this template for submitting enhancement requests -->
+
+<!--
+WARNING: depending on the scope of the enhancement you may be asked to use the
+NPEP process to build consensus around a proposed change. Please carefully read
+through the NPEP overview before submitting this issue:
+https://network-policy-api.sigs.k8s.io/enhancements/
+-->
+
+**Is your enhancement 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.

.github/ISSUE_TEMPLATE/generic-issue.md

@@ -0,0 +1,11 @@
+---
+name: Generic Issue
+about: This template should be used for generic issues which don't match any other
+  templates
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the issue**: