Add bug report and support doc

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+---
+
+### Behaviour
+
+#### Steps to reproduce this issue
+
+1.
+2.
+3.
+
+#### Expected behaviour
+
+> Tell me what should happen
+
+#### Actual behaviour
+
+> Tell me what happens instead
+
+### Configuration
+
+* Repository URL (if public): 
+* Build URL (if public): 
+
+```yml
+# paste your YAML workflow file here and remove sensitive data
+```
+
+### Logs
+
+> Download the [log file of your build](https://help.github.com/en/actions/configuring-and-managing-workflows/managing-a-workflow-run#downloading-logs) and [attach it](https://help.github.com/en/github/managing-your-work-on-github/file-attachments-on-issues-and-pull-requests) to this issue.

.github/SUPPORT.md

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+# Support [![](https://isitmaintained.com/badge/resolution/crazy-max/ghaction-upx.svg)](https://isitmaintained.com/project/crazy-max/ghaction-upx)
+
+## Reporting an issue
+
+Please do a search in [open issues](https://github.com/crazy-max/ghaction-upx/issues?utf8=%E2%9C%93&q=) to see if the issue or feature request has already been filed.
+
+If you find your issue already exists, make relevant comments and add your [reaction](https://github.com/blog/2119-add-reactions-to-pull-requests-issues-and-comments). Use a reaction in place of a "+1" comment.
+
+:+1: - upvote
+
+:-1: - downvote
+
+If you cannot find an existing issue that describes your bug or feature, submit an issue using the guidelines below.
+
+## Writing good bug reports and feature requests
+
+File a single issue per problem and feature request.
+
+* Do not enumerate multiple bugs or feature requests in the same issue.
+* Do not add your issue as a comment to an existing issue unless it's for the identical input. Many issues look similar, but have different causes.
+
+The more information you can provide, the more likely someone will be successful reproducing the issue and finding a fix.
+
+You are now ready to [create a new issue](https://github.com/crazy-max/ghaction-upx/issues/new/choose)!
+
+## Closure policy
+
+* Issues that don't have the information requested above (when applicable) will be closed immediately and the poster directed to the support guidelines.
+* Issues that go a week without a response from original poster are subject to closure at my discretion.