Merge issue templates (PR LMMS#4884)

Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+# Please search the issue tracker for existing bug reports before submitting your own. Delete this line to confirm no similar report has been posted yet.
+
+### Bug Summary
+
+#### Steps to reproduce
+
+#### Expected behavior
+
+#### Actual behavior
+
+#### Screenshot
+
+#### LMMS version used
+
+#### Logs
+<details>
+  <summary>Click to expand</summary>
+<pre>
+<!-- paste logs here -->
+</pre>
+</details>

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+- name: Get help on Discord
+  url: https://lmms.io/chat/
+  about: Need help? Have a question? Reach out to other LMMS users on our Discord server!

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+# Please search the issue tracker for existing feature requests before submitting your own. Delete this line to confirm no similar request has been posted yet.
+
+### Enhancement Summary
+
+#### Justification
+
+#### Mockup
+
+<!-- If your request encompasses changes to the user interface, provide a mockup of your proposal here -->