add a PR github template (dapr#129)

Signed-off-by: mikeee <[email protected]>
Signed-off-by: Zachary Edgell <[email protected]>

Author: mikeee

.github/pull_request_template.md

@@ -0,0 +1,21 @@
+# Description
+
+<!--Please explain the changes you've made here-->
+
+
+
+## Issue reference
+
+<!--We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.-->
+
+<!--Please reference the issue(s) with a hash tag for example #100 -->
+This PR will close #number
+
+## Checklist
+
+<!-- This list is non-exhaustive, please ensure the tests are passing. -->
+<!--Please make sure you've completed the relevant tasks for this PR, out of the following list: -->
+
+* [ ] Code compiles correctly
+* [ ] Created/updated tests
+* [ ] Extended the documentation