[docs] Add issue templates

.github/ISSUE_TEMPLATE/1.bug.md

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+---
+name: Bug report 🐛
+about: Create a bug report for Material-UI.
+labels: 'status: needs triage'
+---
+
+<!-- Provide a general summary of the issue in the Title above -->
+
+<!--
+  Thank you very much for contributing to Material-UI by creating an issue! ❤️
+  To avoid duplicate issues we ask you to check off the following list.
+-->
+
+<!-- Checked checkbox should look like this: [x] -->
+
+- [ ] The issue is present in the latest release.
+- [ ] I have searched the [issues](https://github.com/mui-org/material-ui-x/issues) of this repository and believe that this is not a duplicate.
+
+## Current Behavior 😯
+
+<!-- Describe what happens instead of the expected behavior. -->
+
+## Expected Behavior 🤔
+
+<!-- Describe what should happen. -->
+
+## Steps to Reproduce 🕹
+
+<!--
+  Provide a link to a live example (you can use codesandbox.io) and an unambiguous set of steps to reproduce this bug.
+  Include code to reproduce, if relevant (which it most likely is).
+
+  You should use the official codesandbox template as a starting point: https://material-ui.com/r/issue-template
+
+  If you have an issue concerning TypeScript please start from this TypeScript playground: https://material-ui.com/r/ts-issue-template
+
+  Issues without some form of live example have a longer response time.
+-->
+
+Steps:
+
+1.
+2.
+3.
+4.
+
+## Context 🔦
+
+<!--
+  What are you trying to accomplish? How has this issue affected you?
+  Providing context helps us come up with a solution that is most useful in the real world.
+-->
+
+## Your Environment 🌎
+
+<!--
+  Include as many relevant details about the environment with which you experienced the bug.
+  If you encounter issues with TypeScript please include version and tsconfig.
+-->
+
+| Tech          | Version |
+| ------------- | ------- |
+| Material-UI X | v0.?.?  |
+| React         |         |
+| Browser       |         |
+| TypeScript    |         |
+| etc.          |         |

.github/ISSUE_TEMPLATE/2.feature.md

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+---
+name: Feature request 💄
+about: Suggest a new idea for the project.
+labels: 'status: needs triage'
+---
+
+<!-- Provide a general summary of the feature in the Title above -->
+
+<!--
+  Thank you very much for contributing to Material-UI by creating an issue! ❤️
+  To avoid duplicate issues we ask you to check off the following list.
+-->
+
+<!-- Checked checkbox should look like this: [x] -->
+
+- [ ] I have searched the [issues](https://github.com/mui-org/material-ui-x/issues) of this repository and believe that this is not a duplicate.
+
+## Summary 💡
+
+<!-- Describe how it should work. -->
+
+## Examples 🌈
+
+<!--
+  Provide a link to the Material design specification, other implementations,
+  or screenshots of the expected behavior.
+-->
+
+## Motivation 🔦
+
+<!--
+  What are you trying to accomplish? How has the lack of this feature affected you?
+  Providing context helps us come up with a solution that is most useful in the real world.
+-->

.github/ISSUE_TEMPLATE/3.material-design.md

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+---
+name: Material design issue
+about: An issue with one of our components regarding the Material design guidelines.
+labels: 'status: needs triage, material design system'
+---

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false # force the usage of a template
+contact_links:
+  - name: Support ❔
+    url: https://material-ui.com/getting-started/support/
+    about: I need support with Material-UI.