chore(github): add issue template (#24)

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: "Bug Report"
+description: Report a bug or issue with Grassator.
+title: "[Bug Report]: "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        **Before You Start...**
+
+        This form is only for submitting bug reports. If you have a usage question
+        or are unsure if this is really a bug, please use the [Discussions](https://github.com/noctisynth/Grassator/discussions) section instead.
+
+        Also try to search for your issue - it may have already been answered or even fixed in the development branch.
+        However, if you find that an old, closed issue still persists in the latest version,
+        you should open a new issue using the form below instead of commenting on the old issue.
+  - type: textarea
+    id: steps-to-reproduce
+    attributes:
+      label: Steps to reproduce
+      description: |
+        What do we need to do after opening your repro in order to make the bug happen?
+        Clear and concise reproduction instructions are important for us to be able to triage your issue in a timely manner.
+        Note that you can use [Markdown](https://guides.github.com/features/mastering-markdown/) to format lists and code.
+      placeholder: |
+        Please provide a step-by-step guide to reproduce the issue. If possible,
+        provide screenshots or files like videos that show the issue.
+    validations:
+      required: true
+  - type: input
+    id: repro
+    attributes:
+      label: Reproduce link
+      description: "Please provide a simplest reproduction of the problem, provide the URL of the project:"
+      placeholder: Paste link here
+  - type: textarea
+    id: actually-happening
+    attributes:
+      label: What is actually happening?
+      placeholder: |
+        Describe what happened in detail.
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: QQ Group
+    url: https://qm.qq.com/q/difHwaQXvi
+    about: Click to join the QQ group for discussion.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: "Feature Request"
+description: Submit a feature request or enhancement for Grassator
+title: "[Feature Request]: "
+labels: ["pending triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+       **Before You Start...**
+
+        This form is only for submitting feature requests. If you have a usage question
+        or are unsure if this is really a bug, make sure to:
+        Also try to search for your issue - another user may have already requested something similar!
+
+  - type: textarea
+    id: problem-description
+    attributes:
+      label: What problem does this feature solve?
+      description: |
+        Explain your use case, context, and rationale behind this feature request. More importantly,
+        what is the **end user experience** you are trying to build that led to the need for this feature?
+      placeholder: Problem description
+    validations:
+      required: true
+  - type: textarea
+    id: proposed-API
+    attributes:
+      label: What does the proposed API look like?
+      description: |
+        Describe how you propose to solve the problem and provide code samples of how the API would work once implemented.
+        Note that you can use [Markdown](https://guides.github.com/features/mastering-markdown/) to format your code blocks.
+      placeholder: Proposed API
+    validations:
+      required: true