Create ISSUE_TEMPLATE.md

Author: nicolaskruchten

.github/ISSUE_TEMPLATE.md

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+<!--
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+PLEASE NOTE: the react-plotly.js library is a thin, stable wrapper around the large, active https://github.com/plotly/plotly.js library.
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+Most questions and issues encountered while using react-plotly.js are actually related to plotly.js and it's often best to submit issues in that repo instead of this one: https://github.com/plotly/plotly.js/issues/new
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+Of course, certain issues pertain specifically to the React wrapper and are appropriate for this repo :)
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+-->