Create issue_template.md (#46)

Author: innovate-invent

.github/issue_template.md

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+<!-- 
+Thank you for your interest in contributing to the JMESPath project.
+
+Before opening an issue, please consider the following criteria:
+
+If you have a question about how to do something within the JMESPath syntax, 
+please check to see that the information isn't already listed in the wiki: https://github.com/jmespath-community/jmespath.jep/wiki
+If the information is not available in the wiki, you might want to head over to the JMESPath Gitter for quicker help: https://gitter.im/jmespath/chat
+If you were not able to get help in the Gitter channel, then please open a discussion instead of an issue: https://github.com/jmespath-community/jmespath.jep/discussions
+
+Issues should only be opened for errors within the current specification or with this repository.
+This includes typos, spelling, inconsistencies of the specification across documents, or other clerical issues.
+
+Feature requests must be opened as discussions.
+
+
+Issues that do not follow this criteria will be deleted. Thank you.
+-->