Update issue templates

Some guidance for new issues

.github/ISSUE_TEMPLATE/issue-report.md

@@ -0,0 +1,20 @@
+---
+name: Issue report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+> Delete this text before submitting
+
+For best results from devs, please follow this guidance:
+
+1. Run your examples with the latest version (`remotes::install_github("JanMarvin/openxlsx2"`)
+1. Utilize the [`reprex` package](https://reprex.tidyverse.org/) and create a **minimal** reproducible example
+1. Utilize [`dput()`](https://stat.ethz.ch/R-manual/R-devel/library/base/html/dput.html) for data 
+1. Provide version with `packageVersion("openxlsx2")` (if you didn't follow the step above, this will be a problem)
+1. Utilize `openxlsx2::temp_xlsx()` for file saving
+1. If needed, take a screen shot of your Excel workbook :camera:
+1. Be friendly :smile: