Add GitHub issue templates

Credit to @Andre601 and PR #1735 for the original proposal of these templates.

I've held off from adding this for a while, but I now feel that the GitHub UI is nice enough to justify the change.

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: 🐛 ​ Bug report
+about: Report an issue or problem with the way LuckPerms is functioning.
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+<!-- Before going any further, please check to see if your problem is fixed by updating to a newer version. The latest development builds can be obtained from https://luckperms.net/download -->
+
+### Description
+<!-- Please provide a short description of the issue in the space below. -->
+
+
+### Reproduction steps
+<!-- Please provide a clear list of steps we should follow in order to reproduce your issue in the space below. -->
+
+1. Open the config.yml file and set example to true.
+2. Restart the server
+3. Run /lp user example permission set x from the console
+4. See error
+
+
+### Expected behaviour
+<!-- Please provide a description of what you expected to happen. -->
+
+
+### Environment details
+<!-- Please provide details of your server environment in the space below. -->
+
+* Server type/version: `ExampleSpigot` running version `1.12.2` build `???`
+* LuckPerms version: `v???`
+
+<!-- If you think it would be helpful, please also include a "pastebin" of any relevant config files or log output. You should use https://gist.github.com/ to upload, then include the link below. -->
+
+
+### Any other relevant details
+<!-- Please include any other relevant details in the space below. -->
+

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: 💬 ​ Ask a question
+    url: https://discord.gg/luckperms
+    about: We use Discord to provide support for the project. If you have a question, need help, or aren't sure if you've found a bug or not, please come and talk to us there!

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: 💡 ​ Feature request
+about: Suggest an idea for an improvement or change to LuckPerms.
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+### Description
+<!-- Please provide a short description of the feature request in the space below. -->
+
+
+### Proposed behaviour
+<!-- Please provide a short explanation of how the feature should work / be changed, and how this will affect the project. -->
+