Add issue templates

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: Bug Report
+description: File a bug report
+labels: [bug]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: textarea
+    id: what-should-have-happened
+    attributes:
+      label: What did you expect to happen?
+      placeholder: I expected that...
+    validations:
+      required: true
+  - type: textarea
+    id: what-actually-happened
+    attributes:
+      label: Instead of that, what actually happened?
+      placeholder: ... but instead, what happened was...
+    validations:
+      required: true
+  - type: dropdown
+    id: operating-system
+    attributes:
+      label: Which operating system are you running on?
+      options:
+        - Linux
+        - macOS
+        - Windows
+        - Other
+    validations:
+      required: true
+  - type: input
+    id: dotnet-version
+    attributes:
+      label: Version
+      description: What version of DepotDownloader are you running on?
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant log output
+      description: Please copy and paste any relevant log output. This will be automatically formatted into code, so no need for backticks.
+      render: shell
+  - type: textarea
+    id: additional-info
+    attributes:
+      label: Additional Information
+      description: Is there anything else that you think we should know?
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Discussions
+    url: https://github.com/SteamRE/DepotDownloader/discussions/new
+    about: Please ask and answer questions here.

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: Feature Request
+description: Suggest an idea for this project
+labels: [enhancement]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks, we appreciate good ideas!
+  - type: textarea
+    id: problem-area
+    attributes:
+      label: What problem is this feature trying to solve?
+      placeholder: I'm really frustrated when...
+    validations:
+      required: true
+  - type: textarea
+    id: proposed-solution
+    attributes:
+      label: How would you like it to be solved?
+      placeholder: I think that it could be solved by...
+    validations:
+      required: true
+  - type: textarea
+    id: alternative-solutions
+    attributes:
+      label: Have you considered any alternative solutions
+      placeholder: I did think that that it also could be solved by ..., but...
+    validations:
+      required: true
+  - type: textarea
+    id: additional-info
+    attributes:
+      label: Additional Information
+      description: Is there anything else that you think we should know?
+    validations:
+      required: false