docs: add issue template

.github/ISSUE_TEMPLATES/bug-report.md

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+# Bug report
+
+## Current behavior
+
+<!-- Describe how the issue manifests. -->
+
+## Expected behavior
+
+<!-- Describe what the desired behavior would be. -->
+
+## Environment
+
+- **semantic-release** version: <!-- Version set in package.json devDpendencies -->
+- CI environment: <!-- CI service name -->
+- Plugins used: <!-- List semantic-release plugin used if any -->
+- **semantic-release** configuration: <!-- link to your repository or relevant part of the semantic-release config -->
+- CI logs: <!-- link to your CI logs or semantic-release logs -->

.github/ISSUE_TEMPLATES/feature-request.md

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+# Feature request
+
+## New feature motivation
+
+<!-- Describe the context, the use-case and the advantages of the feature request. -->
+
+## New feature description
+
+<!-- Describe the functional changes that would have to be made in semantic-release or its plugins. -->
+
+## New feature implementation
+
+<!-- Optionally describe the technical changes to be made in semantic-release or its plugins. -->

.github/ISSUE_TEMPLATES/plugin-request.md

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+# New plugin request
+
+## New plugin motivation
+
+<!-- Describe the reasons to create a new plugin and why it's not covered by the existing ones. -->
+
+## Third-party documentation
+
+<!-- Provide explanation and documentation links for the platform to integrate with. -->