Add issue templates (hashicorp#689)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: You're experiencing an issue with the Consul Helm chart that is different than the documented behavior.
+labels: bug
+
+---
+
+When filing a bug, please include the following headings if possible. Any example text in this template can be deleted.
+
+### Overview of the Issue
+
+A paragraph or two about the issue you're experiencing.
+
+### Reproduction Steps
+
+Steps to reproduce this issue, eg:
+
+1. When running helm install with the following `values.yml`:
+```
+global:
+  domain: consul
+  datacenter: dc1
+server:
+  replicas: 1
+  bootstrapExpect: 1
+connectInject:
+  enabled: true
+controller:
+  enabled: true
+```
+1. View error
+
+### Logs
+
+Include any relevant logs.
+
+<details>
+  <summary>Logs</summary>
+
+```
+output from 'kubectl logs' in relevant components
+```
+
+</details>
+
+### Expected behavior
+
+What was the expected result?
+
+### Environment details
+
+If not already included, please provide the following:
+- `consul-k8s` version:
+- `consul-helm` version:
+- `values.yaml` used to deploy the helm chart:
+
+Any other information you can provide about the environment/deployment.
+
+### Additional Context
+
+Additional context on the problem.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Consul on Kubernetes GitHub Issues
+    url: https://github.com/hashicorp/consul-k8s/issues
+    about: Are you submitting an issue or feature enhancement for the consul-k8s binary? Please create an issue in the consul-k8s repository.
+  - name: Consul on Kubernetes Learn Tutorials
+    url: https://learn.hashicorp.com/collections/consul/kubernetes
+    about: Please check out our Learn Tutorials. These hands on tutorials deal with many of the tasks common to using Consul on Kubernetes.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: If you have something you think Consul Helm could improve or add support for.
+labels: enhancement
+
+---
+
+Please search the existing issues for relevant feature requests, and use the reaction feature (https://blog.github.com/2016-03-10-add-reactions-to-pull-requests-issues-and-comments/) to add upvotes to pre-existing requests.
+
+#### Is your feature request related to a problem? Please describe.
+
+A clear and concise description of what the problem is.
+
+#### Feature Description
+
+A written overview of the feature.
+
+#### Use Case(s)
+
+Any relevant use-cases that you see.
+
+#### Contributions
+
+Are you able to contribute the changes to make this feature work?
+

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: If you have a question.
+labels: question
+
+---
+Please search the existing issues for relevant questions, and use the reaction feature (https://blog.github.com/2016-03-10-add-reactions-to-pull-requests-issues-and-comments/) to add upvotes to pre-existing questions.
+
+#### Question
+
+Please provide as many details as you can, including but not limited to
+- Helm command you're running
+- Any values you've configured
+- Your current understanding, and what you're trying to figure out
+
+More details will help us answer questions more accurately and with less delay :)
+