Add a bug report template

Author: frankier

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,29 @@
+---
+name: Bug report
+about: Report a suspected bug or incompatibility in RCall.jl
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Please try to create as small a reproduction as possible.
+
+ * How did you install RCall.jl and configure the R location?
+ * Did you install any R packages or other packages? Using what method? 
+ * Finally what code did you run?
+
+Please include this information even if it relates to an earlier issue which has been closed.
+
+**Expected and actual behavior**
+Describe what happened versus what you expected to happen.
+
+**Version information**
+Please include the output of `using RCall; RCall.versioninfo()` if possible. Otherwise please include `Main.versioninfo()` from Julia and `sessionInfo()` from R.
+
+**Additional context**
+Add any other context about the problem here.