Added issue template

Author: jbornemann

.github/ISSUE_TEMPLATE.md

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+Thanks for taking the time to fill out an issue! To help the community solve your issue, please provide answers to the following questions, along with supporting log and configuration files.
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+**What version of AEM are you running?**
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+**How do you produce the issue?**
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+**Does the issue occur consistently?** 
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+**Any additional details?**
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