Update issue templates

New issue template

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,29 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: dramanica
+
+---
+
+<!--
+Before filing a bug report, please check that there are no issues (open or closed) that already deal with the same bug,
+and test against the development version of `pastclim` (see <https://github.com/EvolEcolGroup/pastclim> for how to install it)
+
+Please include a minimal reproducible example (AKA a reprex). If you've never heard of a [reprex](http://reprex.tidyverse.org/) before, start by reading <https://www.tidyverse.org/help/#reprex>. Ensure that your reprex generates the error when you paste it into a fresh
+instance of `R`, with no additional variables/packages being loaded. Please also include the output of `utils::sessionInfo()`.
+
+For more advice on how to write a great issue, see <https://code-review.tidyverse.org/issues/>.
+
+-->
+
+Brief description of the problem and what output you expected.
+
+```r
+# insert reprex here (showing both the code and the error/unexpected output)
+```
+
+```r
+# insert the output of `utils::sessionInfo()`
+```