Create Issue templates (#456)

* Add a template for feature requests

* Add a issue template for bugs

* Add a template for questions

* Add issue template for the documentation

* Add Gitter chat to the issue creation dialog

* Address comments from @NextTurn

.github/ISSUE_TEMPLATE/1-feature-request.md

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+---
+name: "🚀 Feature request"
+labels: new-feature
+about: I have a suggestion (and may want to implement it 🙂)!
+---
+
+### Feature Request
+
+**Problem statement.**
+A clear and concise description of what the problem is. Ex. `I have an issue when [...]`, `As a WinSW user, I want to [...]`
+
+**Describe the solution you'd like.**
+Add any considered drawbacks.
+
+**Describe alternatives you've considered.**
+A clear and concise description of any alternative solutions or features you've considered.

.github/ISSUE_TEMPLATE/2-bug-report.md

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+---
+name: "🐛 Bug report"
+labels: bug
+about: Create a bug report to help us improve
+---
+
+**Summary**. Describe the expected and actual behavior here.
+
+## Steps to reproduce
+
+Please clarify how to reproduce the issue.
+
+If you need to attach your configuration, please do it pelow:
+
+```xml
+TODO
+```
+
+## Environment
+
+* WinSW version: TODO
+* WinSW package type: TODO (e.g. .NET 4.6.1 )
+* Windows version: TODO
+* Wrapped executable and version: TODO <!-- e.g. "internal project", "Jenkins 2.222.1"-->
+
+## Possible Solution
+
+If you have suggestions on a fix for the bug, please describe it here.

.github/ISSUE_TEMPLATE/3-documentation.md

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+---
+name: ":pencil: Documentation"
+labels: documentation
+about: Let us know if any documentation is missing or could be improved
+---
+
+**Summary**. Describe your use-case which is not covered by existing documentation.
+If it is easier to submit a documentation patch instead of writing an issue, just do it!

.github/ISSUE_TEMPLATE/4-question.md

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+---
+name: "❓ Need help"
+labels: question
+about: Please ask in our Gitter channel first
+---
+
+---
+We primarily use GitHub as an issue tracker. 
+For usage and support questions, please ask in our [Gitter chat](https://gitter.im/winsw/winsw) first.
+Thanks!
+---
+
+### Problem statement
+
+Please describe your issue here, and explain what you have already tried to resolve it.
+

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Gitter chat
+    url: https://gitter.im/winsw/winsw
+    about: Please ask and answer questions here.