Add issue template for better orientation

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Bug report
+about: Found a bug in our project? Create a report to help us improve.
+labels: bug
+---
+
+<!-- Add enough information so we can understand your problem -->
+
+```php
+// Please add code examples if possible, so we can reproduce your steps
+```

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Report a security vulnerability
+    url: https://reactphp.org/#support
+    about: 'If you discover a security vulnerability, please send us an email. Do not disclose security-related issues publicly.'
+  - name: Feature request
+    url: https://github.com/orgs/reactphp/discussions/categories/ideas
+    about: 'You have ideas to improve our project? Start a new discussion in our "Ideas" category.'
+  - name: Questions
+    url: https://github.com/orgs/reactphp/discussions/categories/q-a
+    about: 'We are happy to answer your questions! Start a new discussion in our "Q&A" category.'