Create ISSUE_TEMPLATE.md

ISSUE_TEMPLATE.md

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+Please make sure that the boxes below are checked before you submit your issue. Only use GitHub issues for issues with the implementation, not for issues with specific datasets or general questions about functionality. If your issue is an implementation question, please ask your question on the [#keras-retinanet Slack channel](https://github.com/fizyr/keras-retinanet#discussions) and ask there instead of filing a GitHub issue.
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+Thank you!
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+- [ ] Check that you are up-to-date with the master branch of keras-retinanet.
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+- [ ] Check that you are up-to-date with the latest version of [Keras](https://github.com/keras-team/keras). 
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+- [ ] Check that you are up-to-date with the latest version of TensorFlow. The installation instructions can be found [here](https://www.tensorflow.org/get_started/os_setup).
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+- [ ] Check that you have read the entire [README.md](https://github.com/fizyr/keras-retinanet/README.md). Most noticably the [FAQ](https://github.com/fizyr/keras-retinanet#faq) section shows common issues.
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+- [ ] Provide a link to a GitHub Gist of a Python script that can reproduce your issue (or just copy the script here if it is short).