Create issue templates (#655)

Author: szmarczak

.github/ISSUE_TEMPLATE/1-bug-report.md

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+---
+name: "🐞 Bug report"
+about: Something is not working as it should
+---
+
+#### Describe the bug
+
+ - Node.js version: 
+ - OS & version: 
+
+<!-- A clear and concise description of what the bug is. -->
+
+#### Actual behavior
+
+...
+
+#### Expected behavior
+
+...
+
+#### Code to reproduce
+
+```js
+...
+```
+
+<!--
+We encourage you to submit a pull request with a failing test:
+ - This will make it more likely for us to prioritize your issue.
+ - It's a good way to prove that the issue is related to Got and not your code. 
+
+Example: https://github.com/avajs/ava/blob/master/docs/01-writing-tests.md#failing-tests
+-->
+
+#### Checklist
+
+- [ ] I have read the documentation.
+- [ ] I have tried my code with the latest version of Node.js and Got.

.github/ISSUE_TEMPLATE/2-feature-request.md

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+---
+name: "⭐ Feature request"
+about: Suggest an idea for Got
+---
+
+#### What problem are you trying to solve?
+
+...
+
+#### Describe the feature
+
+...
+
+<!-- Include a usage example of the feature. If the feature is currently possible with a workaround, include that too. -->
+
+#### Checklist
+
+- [ ] I have read the documentation and made sure this feature doesn't already exist.

.github/ISSUE_TEMPLATE/3-question.md

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+---
+name: "❓ Question"
+about: Something is unclear or needs to be discussed
+---
+
+#### What would you like to discuss?
+
+...
+
+#### Checklist
+
+- [ ] I have read the documentation.

.github/PULL_REQUEST_TEMPLATE.md

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+#### Checklist
+
+- [ ] I have read the documentation.
+- [ ] I have included a pull request description of my changes.
+- [ ] I have included some tests.
+- [ ] If it's a new feature, I have included documentation updates.