Add Bug/Feature templates (#363)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug in a Marlin Configuration
+title: "[BUG] (short description)"
+labels: ''
+assignees: ''
+
+---
+
+<!--
+
+Please follow the instructions below. Failure to do so may result in your issue being closed.
+
+### Before Reporting a Bug
+
+1. Test with the `import-2.0.x` branch to see whether the issue still exists. This will require testing with the Marlin `bugfix-2.0.x` branch.
+
+2. Get troubleshooting help from the Marlin community to confirm it's a bug and not just a configuration error. Links at https://github.com/MarlinFirmware/Configurations/issues/new/choose
+
+### Instructions
+
+1. Fill out every section of the template below.
+
+2. Always attach configuration files, regardless of whether you think they are involved.
+
+3. Read and understand Marlin's Code of Conduct. By filing an Issue, you are expected to comply with it, including treating everyone with respect: https://github.com/MarlinFirmware/Marlin/blob/master/.github/code_of_conduct.md
+
+-->
+
+### Bug Description
+
+<!-- Describe the bug in this section. (You can remove this invisible comment.) -->
+
+### Configuration Files
+
+**Required:** Include a ZIP file containing `Configuration.h` and `Configuration_adv.h`.
+
+If you've made any other modifications describe them in detail here.
+
+### Steps to Reproduce
+
+<!-- Describe the steps needed to reproduce the issue. (You can remove this invisible comment.) -->
+
+1. [First Step]
+2. [Second Step]
+3. [and so on...]
+
+**Expected behavior:**
+
+<!-- Describe what you expected to happen here. (You can remove this invisible comment.) -->
+
+**Actual behavior:**
+
+<!-- Describe what actually happens here. (You can remove this invisible comment.) -->
+
+#### Additional Information
+
+* Provide pictures or links to videos that clearly demonstrate the issue.
+* See [Contributing to Marlin](https://github.com/MarlinFirmware/Marlin/blob/2.0.x/.github/contributing.md) for additional guidelines.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Marlin Documentation
+    url: http://marlinfw.org/
+    about: Lots of documentation on installing and using Marlin.
+  - name: MarlinFirmware Facebook group
+    url: https://www.facebook.com/groups/1049718498464482
+    about: Please ask and answer questions here.
+  - name: Marlin on Discord
+    url: https://discord.gg/n5NJ59y
+    about: Join the Discord server for support and discussion.
+  - name: Marlin Discussion Forum
+    url: http://forums.reprap.org/list.php?415
+    about: A searchable web forum hosted by RepRap dot org.
+  - name: Marlin Videos on YouTube
+    url: https://www.youtube.com/results?search_query=marlin+firmware
+    about: Tutorials and more from Marlin users all around the world. Great for new users!

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Configuration request
+about: Request a Configuration
+title: "[FR] (configuration request title)"
+labels: ''
+assignees: ''
+
+---
+
+<!--
+
+Have you read Marlin's Code of Conduct? By filing an Issue, you are expected to comply with it, including treating everyone with respect: https://github.com/MarlinFirmware/Marlin/blob/master/.github/code_of_conduct.md
+
+Do you want to ask a question? Are you looking for support? Please don't post here. Instead please use one of the support links at https://github.com/MarlinFirmware/Configurations/issues/new/choose
+
+Before filing an issue be sure to test the "bugfix" branches to see whether the issue has been resolved.
+
+-->
+
+### Description
+
+<!-- Description of the requested configuration -->
+
+### Configuration Details
+
+<!-- Please describe the hardware/configuration if known. -->
+
+* Manufacturer:
+* Model:
+* Motherboard:
+
+#### Additional Information
+
+* Provide links to the requested printer/configuration.