.github: Create GitHub issue templates (#3180)

.github/ISSUE_TEMPLATE/1-bug_report.yml

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+name: Bug Report
+description: Template for reporting bugs
+title: "[BUG]: "
+labels: "bug"
+body:
+  - type: markdown
+    attributes:
+      value: Tech support does not belong here. You should only file an issue here if you think you have experienced an actual bug with Vita3K.
+             Android specific issues should go to https://github.com/Vita3K/Vita3K-Android/issues/new, and
+             Game specific issues should go to the respective game issue in https://github.com/Vita3K/compatibility.
+  - type: checkboxes
+    attributes:
+      label: Is there an existing issue for this?
+      description: Please search to see if an issue already exists for the bug you encountered.
+      options:
+      - label: I have searched the existing issues
+        required: true
+  - type: input
+    attributes:
+      label: Affected Build(s)
+      description: List the affected build(s) that this issue applies to.
+      placeholder: v0.1.2 3456
+    validations:
+      required: true
+  - type: textarea
+    id: issue-desc
+    attributes:
+      label: Description of Issue
+      description: A brief description of the issue encountered along with any images and/or videos.
+    validations:
+      required: true
+  - type: textarea
+    id: expected-behavior
+    attributes:
+      label: Expected Behavior
+      description: A brief description of how it is expected to work along with any images and/or videos.
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction-steps
+    attributes:
+      label: Reproduction Steps
+      description: A brief explanation of how to reproduce this issue. If possible, provide a save file to aid in reproducing the issue.
+    validations:
+      required: true
+  - type: textarea
+    id: log
+    attributes:
+      label: Log File
+      description: A log file will help our developers to better diagnose and fix the issue.
+    validations:
+      required: true
+  - type: textarea
+    id: system-config
+    attributes:
+      label: System Configuration
+      value: |
+        CPU:
+        GPU/Driver:
+        RAM:
+        OS:
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/2-feature_request.yml

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+name: Feature Request
+description: Template for feature request
+title: "[Feature Request]: "
+labels: "Feature Request"
+body:
+  - type: markdown
+    attributes:
+      value: Tech support does not belong here. You should only file an issue here if you are requesting a feature you believe would make Vit3K better.
+  - type: checkboxes
+    attributes:
+      label: Is there an existing issue for this?
+      description: Please search to see if an issue already exists for the feature you are requesting.
+      options:
+      - label: I have searched the existing issues
+        required: true
+  - type: textarea
+    id: what-feature
+    attributes:
+      label: What feature are you suggesting?
+      description: A brief description of the requested feature.
+    validations:
+      required: true
+  - type: textarea
+    id: why-feature
+    attributes:
+      label: Why would this feature be useful?
+      description: A brief description of why this feature would make Vita3K better.
+    validations:
+      required: true
+  - type: textarea
+    id: notes
+    attributes:
+      label: Other emulators or software with a similar feature
+      description: >
+        May be helpful in showing someone how it'd be helpful.
+  - type: dropdown
+    id: platform
+    attributes:
+      label: Platform (if relevant)
+      options:
+        - Windows
+        - Linux
+        - macOS

.github/ISSUE_TEMPLATE/3-blank_template.md

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+---
+name: Blank Template
+about: Templates for anything that is not a bug report or feature request
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Please do not ask for help or report compatibility regressions here, use [Vita3K Discord server](https://discord.gg/6aGwQzh) or [compatibility issue tracker](https://github.com/Vita3K/compatibility) instead.
+
+Please be careful when using this template.
+Make sure you have provided the necessary information.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Vita3K Discord
+    url: https://discord.gg/6aGwQzh
+    about: Please ask questions or seek tech support on Discord
+  - name: Report game compatibility
+    url: https://github.com/Vita3K/compatibility
+    about: Please report game compatibility and regressions here
+  - name: Android
+    url: https://github.com/Vita3K/Vita3K-Android/issues
+    about: Please open Android specific issues here