Add bug report template

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report a bug in GDExtension Summator
+body:
+
+- type: markdown
+  attributes:
+    value: |
+      - Write a descriptive issue title above.
+      - Search [open](https://github.com/paddy-exe/GDExtensionSummator/issues) and [closed](https://github.com/paddy-exe/GDExtensionSummator/issues?q=is%3Aissue+is%3Aclosed) issues to ensure it has not already been reported.
+
+- type: input
+  attributes:
+    label: Godot version
+    description: >
+      Specify the Git commit hash of your Godot build.
+    placeholder: v4.0.beta4.official [e6751549c]
+  validations:
+    required: true
+
+- type: input
+  attributes:
+    label: godot-cpp version
+    description: >
+      Specify the Git commit hash of the godot-cpp submodule in your project. You can run `git status` inside the folder to check it.
+    placeholder: v4.0.beta4.official [e6751549c]
+  validations:
+    required: true
+
+- type: input
+  attributes:
+    label: System information
+    description: |
+      Specify the OS version.
+    placeholder: Windows 10
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Issue description
+    description: |
+      Describe your issue briefly. What doesn't work, and how do you expect it to work instead?
+      You can include images or videos with drag and drop, and format code blocks or logs with <code>```</code> tags.
+  validations:
+    required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true