Create PULL_REQUEST_TEMPLATE.md

PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,16 @@
+# Summary
+
+This PR add the ability to do XYZ...
+
+# Changes these areas
+
+- [ ] Config
+- [ ] Bugfixes
+- [ ] Command line interface
+- [ ] Feature behavior
+- [ ] Internal design
+- [ ] Archived data layout on disk
+
+# Roadmap Goals
+
+This PR helps us move towards ____ roadmap goal, as outlined here: https://github.com/pirate/ArchiveBox#roadmap