Merge pull request open-mpi#982 from hppritcha/topic/add_issues_template

add an ISSUES template to ompi-release repo

Author: hppritcha

ISSUE_TEMPLATE.md

@@ -0,0 +1,6 @@
+Thanks very much for your interest in opening issues against Open MPI.
+This helps us make a better product!
+
+However, do not open issues on the open-mpi/ompi-release repo.
+Rather, please open issues on the [open-mpi/ompi](https://github.com/open-mpi/ompi/issues) repo.
+