Create issue template, configure only templated issues allowed

Author: J-MR-T

.github/ISSUE_TEMPLATE/*kotlin-specific*-wit-bindgen-issue.md

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+---
+name: "*Kotlin-specific* wit-bindgen issue"
+about: Issue that relates specifically to the kotlin backend of this wit-bindgen fork
+title: ''
+labels: ''
+assignees: J-MR-T
+
+---
+
+# *Kotlin-specific* wit-bindgen issue
+- [ ] I've understood that this repository only hosts a fork of the original wit-bindgen, and is not concerned with maintaining or correcting functionality related to any wit-bindgen backends except `kotlin`. Issues relating to other wit-bindgen backends should be filed [upstream](https://github.com/bytecodealliance/wit-bindgen/). Issues related to other problems with Kotlin's prototype of WebAssembly component model support should be filed in the [Kotlin YouTrack project](https://youtrack.jetbrains.com/issues/KT). Thank you!
+- Feel free to delete this section for the actual issue.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false