Add issue templates

Author: fvictorio

.github/ISSUE_TEMPLATE.md

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+name: Bug report
+description: File a bug report
+body:
+  - type: input
+    id: version
+    attributes:
+      label: "Version of Hardhat"
+      description: "Run `npx hardhat --version` to get the version of Hardhat that you are using"
+      placeholder: "1.2.3"
+    validations:
+      required: true
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: "What happened?"
+      description: "A brief description of what happened and what you expected to happen"
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction-steps
+    attributes:
+      label: "Minimal reproduction steps"
+      description: "Tell us the minimal steps needed to reproduce the bug"
+    validations:
+      required: true
+  - type: input
+    id: search-terms
+    attributes:
+      label: "Search terms"
+      description: "Include the search terms you used before opening this issue. This will make it easier for others to find it."

.github/ISSUE_TEMPLATE/bug-report.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Do you need help?
+    url: https://hardhat.org/hardhat-runner/docs/guides/getting-help
+    about: Check our guide on how to get help with Hardhat

.github/ISSUE_TEMPLATE/config.yml

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+name: Feature request
+description: Suggest a new feature
+body:
+  - type: textarea
+    id: feature-description
+    attributes:
+      label: "Describe the feature"
+      description: "A description of what you would like us to add to Hardhat and your use case for it"
+    validations:
+      required: true
+  - type: input
+    id: search-terms
+    attributes:
+      label: "Search terms"
+      description: "Include the search terms you used before opening this issue. This will make it easier for others to find it."

.github/ISSUE_TEMPLATE/feature-request.yml

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+---
+name: Other issue
+about: Other kind of issue. Please don't use this to ask questions.
+---