Add issue template (#175)

Author: ota-meshi

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Create a report to help us improve.
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: checkboxes
+    id: sanity-checks
+    attributes:
+      label: Before You File a Bug Report Please Confirm You Have Done The Following...
+      description: If any of these required steps are not taken, we may not be able to review your issue. Help us to help you!
+      options:
+        - label: I have tried restarting my IDE and the issue persists.
+          required: true
+        - label: I have updated to the latest version of the packages.
+          required: true
+  - type: input
+    id: eslint-version
+    attributes:
+      label: What version of ESLint are you using?
+      placeholder: 0.0.0
+    validations:
+      required: true
+  - type: input
+    id: eslint-plugin-svelte-version
+    attributes:
+      label: What version of `eslint-plugin-svelte` are you using?
+      placeholder: 0.0.0
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: What did you do?
+      description: |
+        Please include a *minimal* reproduction case.
+      value: |
+        <details>
+        <summary>Configuration</summary>
+
+        ```
+        <!-- Paste your configuration here -->
+        ```
+        </details>
+
+        ```svelte
+        <!-- Paste your code here -->
+        ```
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: What did you expect to happen?
+      description: |
+        You can use Markdown in this field.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: What actually happened?
+      description: |
+        Please copy-paste the actual ESLint output. You can use Markdown in this field.
+    validations:
+      required: true
+  - type: textarea
+    id: bug-reproduction
+    attributes:
+      label: Link to Minimal Reproducible Example
+      description: |
+        Create a minimal reproduction of the problem. **A minimal reproduction is required** so that others can help debug your issue. If a report is vague (e.g. just a generic error message) and has no reproduction, it may be closed.  
+        [Why Reproductions are Required](https://antfu.me/posts/why-reproductions-are-required)
+      placeholder: |
+        https://github.com/[your]/[repo]
+        or
+        https://ota-meshi.github.io/eslint-plugin-svelte/playground/#[hash]
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Additional comments

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest a new feature.
+labels: [enhancement]
+
+body:
+  - type: textarea
+    attributes:
+      label: Description
+      description: |
+        A clear and concise description of the new feature.  
+        Also give a few code examples.
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/new_rule_request.yml

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+name: New rule request
+description: Propose a new rule to be added.
+labels: [enhancement, new rule]
+
+body:
+  - type: textarea
+    attributes:
+      label: Motivation
+      description: |
+        A clear and concise description of the problem the new rule is supposed to solve.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Description
+      description: |
+        A clear and concise description of the new rule.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Examples
+      description: |
+        Add some examples of svelte that the rule does and does not report.
+      value: |
+        ```svelte
+        <script>
+        <script>
+
+        <!-- ✓ GOOD -->
+        <Foo />
+        <Foo />
+        <Foo />
+
+        <!-- ✗ BAD -->
+        <Foo />
+        <Foo />
+        <Foo />
+        ```
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Additional comments

.github/ISSUE_TEMPLATE/other.md

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+---
+name: Other
+about: An issue that doesn't fit into the other categories.
+title: ""
+labels: ""
+assignees: ""
+---