Add bug report issue template

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,70 @@
+name: Bug Report
+description: Something isn't working
+labels: [bug]
+body:
+  - id: validation
+    type: checkboxes
+    attributes:
+      label: Before opening this issue, I ensure that...
+      options:
+      - label: I have checked **both open and closed** issues and confirmed this bug has not already been reported.
+        required: true
+      - label: I am not asking for tech support (e.g. game closing on startup, error when trying to build, etc).
+        required: true
+      - label: I am not asking for modding support or reporting a bug in a specific mod; this bug either occurs without mods enabled or is directly related to the mod loader.
+        required: true
+      - label: This bug is not related to any unofficial fork/port of the decompilation, and any issues with those should be kept in the appropriate repository.
+        required: true
+  - id: expected-behavior
+    type: input
+    validations:
+      required: true
+    attributes:
+      label: Expected Behavior
+      description: What behavior is supposed to occur?
+  - id: actual-behavior
+    type: input
+    validations:
+      required: true
+    attributes:
+      label: Actual Behavior
+      description: What actually happens?
+  - id: repro-steps
+    type: textarea
+    validations:
+      required: true
+    attributes:
+      label: Steps to Reproduce
+      description: How can you reproduce the bug? Please give clear instructions.
+      placeholder: |
+        1. Do this
+        2. Do that
+        3. This happens
+  - id: screenshots
+    type: textarea
+    validations:
+      required: false
+    attributes:
+      label: Screenshots
+      description: Provide screenshots if applicable.
+  - id: log-file
+    type: textarea
+    validations:
+      required: false
+    attributes:
+      label: Log File
+      description: If EngineDebugMode is enabled in settings.ini, the decompilation will write to a log file named log.txt. You can provide it here if you believe it will be helpful.
+  - id: decomp-version
+    type: input
+    validations:
+      required: true
+    attributes:
+      label: Decompilation Version
+      description: The decompilation version. If you built it manually or are using an autobuild, please specify the commit if possible.
+  - id: comments
+    type: textarea
+    validations:
+      required: false
+    attributes:
+      label: Additional Comments
+      description: Provide any additional information if needed.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Retro Engine Modding Server
+    url: https://dc.railgun.works/retroengine
+    about: If you have any questions about the decompilation or want help with modding, ask here.