Add a template for GitHub issues

[florisvdh]

Some ideas:

• reprex
• sessioninfo::session_info()
• qgis_version(query = TRUE, debug = TRUE)
• make sure to use currently supported QGIS version only: current LTR or current QGIS. Too often I end up asking to upgrade QGIS, even if it is just to rule out this potential source of a problem.
• qgis_disable_plugins() and try again
• capture QGIS setup problems here; if same problem occurs in QGIS GUI then problem should not be reported in this repo. Divert to:
  • plugin setup: https://docs.qgis.org/latest/en/docs/user_manual/plugins/plugins.html
  • setup of external processing providers: https://docs.qgis.org/latest/en/docs/user_manual/processing/3rdParty.html
  • QGIS support: https://qgis.org/en/site/forusers/support.html
  • suspecting a bug in QGIS? https://github.com/qgis/QGIS/issues
• try to avoid issue duplication, so check existing (open & closed) issues
• have patience; be friendly and understanding

[florisvdh]

Perhaps with a choice to choose between, leading to some directed help and tips:

• R package loading problem (*)
• problem in using a QGIS plugin (*)
• other issue
• feature request

Until now, (*) is seen most often.