Add issue templates

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Bug Report
+about: Something isn't working as expected
+labels: bug
+---
+
+<!--
+ Before opening an issue, please check whether a similar issue has already been created.
+
+ Please fill in the following information. Additionally, provide screenshots and other resources that may help with the understanding of the issue.
+-->
+
+### Environment
+
+- **App version?**
+- **macOS version?**
+
+### Bug Information
+
+- **What are you trying to do?**
+- **What's the expected behavior?**
+- **What's the actual behavior?**

.github/ISSUE_TEMPLATE/feature.md

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+---
+name: Feature Request
+about: Suggestions for new or different behavior
+labels: enhancement
+---
+
+<!--
+ Before opening an issue, please check whether a similar issue has already been created.
+
+ Please describe your feature request below.
+-->

.github/ISSUE_TEMPLATE/file-type.md

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+---
+name: File Type Request
+about: Request to support previews for a new file type
+title: "Support for [FILE TYPE]"
+labels: new file type
+---
+
+<!--
+ Before opening an issue, please check whether a similar issue has already been created.
+
+ Please fill in the following information about the file type you'd like to see supported.
+-->
+
+- **What's the file's extension?**
+- **What's the file's Uniform Type Identifier (output of `mdls -name kMDItemContentType /path/to/your/file`)?**
+- **What kind of preview do you expect? How can it be generated?**