added PR template

Author: timcadman

PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,20 @@
+## Instructions & checklist for PR author
+
+### Description of changes
+[Add descriptions of changes made]
+
+### Refactor instructions
+- [ ] Replaced  `x <- eval(parse(text = x.name), envir = parent.frame())` with `x <- .loadServersideObject(x)`
+- [ ] If necessary, check the class of the object using `.checkClass()`
+
+### Testing instructions
+- [ ] Writen server-side unit tests for unhappy flow
+- [ ] Run `devtools::test(filter = "smk-|disc|arg")` and check it passes
+- [ ] Run `devtools::check(args = '--no-tests')` and check it passes (we run tests separately to skip performance checks)
+- [ ] Run `devtools::build()` and check it builds without errors
+
+## Instructions & checklist for PR reviewers
+- [ ] Run `devtools::test(filter = "smk-|disc|arg")` and check it passes
+- [ ] Run `devtools::check(args = '--no-tests')` and check it passes (we run tests separately to skip performance checks)
+- [ ] Run `devtools::build()` and check it builds without errors
+