Create ISSUE_TEMPLATE.md

Author: be-hase

.github/ISSUE_TEMPLATE.md

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+## Do this before creating an issue
+
+- Check the [FAQ](https://github.com/line/line-bot-faq) for LINE bots
+- Make sure your issue is **related to** the LINE Bot SDK. For general questions or issues about LINE bots, create an issue on the [FAQ](https://github.com/line/line-bot-faq) repository. Note that we don't provide technical support.
+
+## When creating an issue
+
+- Provide detailed information about the issue you had with the SDK
+- Provide logs if possible
+
+