Add issue and pull_request templates. (#713)

* Add issue and pull_request templates.

* Scratch itches

* Respond to review comments.

* Add Stack Overflow link.

* Add impact to issue template, type-of-change to pr.

* Reorder impact, development phase; add development phase to issue.

1 files changed, 19 insertions, 0 deletions

diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
new file mode 100644
index 00000000..eb460342
--- /dev/null
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -0,0 +1,19 @@
+* **Related issue** (if applicable)
+
+* **Type of change**
+  - [ ] Bug report
+  - [ ] Feature request
+  - [ ] Other enhancement
+
+* **Impact**
+  - [ ] no functional change
+  - [ ] API addition (no impact on existing code)
+  - [ ] API modification
+
+* **Development Phase**
+  - [ ] proposal
+  - [ ] implementation
+
+* **Release Notes**
+
+Text from here to the end of the body will be considered for inclusion in the release notes for the version containing this pull request.