add issue template (#139)

.github/ISSUE_TEMPLATE/add_device.yml

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+name: Contribute to Unofficially Supported Device
+description: Add your device kernel source to KernelSU's Unofficially Supported Device List
+title: "[Add Device]: "
+labels: ["add-device"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for supporting KernelSU !
+  - type: input
+    id: repo-url
+    attributes:
+      label: Repository URL
+      description: Your repository URL
+      placeholder: https://github.com/tiann/KernelSU
+    validations:
+      required: true
+  - type: input
+    id: device
+    attributes:
+      label: Device
+      description: Please describe the device maintained by you.
+      placeholder: GKI 2.0 Device
+    validations:
+      required: true
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue, you should be the maintainer of the repository.
+      options:
+        - label: I'am the maintainer of this repository
+          required: true

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Smartphone (please complete the following information):**
+ - Device: [e.g. iPhone6]
+ - OS: [e.g. iOS8.1]
+ - Version [e.g. 22]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/custom.md

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+---
+name: Custom issue template
+about: Describe this issue template's purpose here.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.