add ISSUE_TEMPLATE.md

Author: albertcht

.github/ISSUE_TEMPLATE.md

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+Please answer these questions before submitting your issue. Thanks!
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+1. Please provide your PHP and Swoole version. (`php -v` and `php --ri swoole`)
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+2. Please provide your Laravel/Lumen version.
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+3. What did you do? If possible, provide a recipe for reproducing the error.
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+4. What did you expect to see?
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+5. What did you see instead?
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