chore: github issue template

Author: vlapo

.github/issue_template.md

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+<!--🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅
+
+Oh hi there! 😄
+
+To expedite issue processing please search open and closed issues before submitting a new one.
+Existing issues often contain information about workarounds, resolution, or progress updates.
+
+🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅-->
+
+### Description
+
+<!-- ✍️ edit: --> A clear and concise description of the problem/question...
+
+### Reproduction
+
+<!--
+Please create and share reproduction of the issue starting with this template: https://stackblitz.com/fork/class-validator-boilerplate
+-->
+<!-- ✍️ edit: --> https://stackblitz.com/...
+
+<!--
+If StackBlitz is not suitable for reproduction of your issue, please create a minimal GitHub repository with the reproduction of the issue.
+Share the link to the repo below along with step-by-step instructions to reproduce the problem, as well as expected and actual behavior.
+-->
+
+### Environment
+
+- [ ] nodejs: <!-- ✍️ edit: nodejs version -->
+- [ ] browser: <!-- ✍️ edit: browser version -->
+- [ ] framework/library: <!-- ✍️ edit: e.g. angular, nestjs + version -->
+
+**class-validator version:** <code><!-- ✍️je  edit: --></code>