add PR template.
diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
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+++ b/.github/pull_request_template.md
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+Following this checklist to help us incorporate your contribution quickly and easily:
+
+- [ ] Make sure there is a [JIRA issue](https://issues.apache.org/jira/browse/MJDEPRSCAN) filed for the change (usually
+ before you start working on it). Trivial changes like typos do not require a JIRA issue. Your pull request should
+ address just this issue, without pulling in other changes.
+- [ ] Each commit in the pull request should have a meaningful subject line and body.
+- [ ] Format the pull request title like `[MJDEPRSCAN-XXX] - Fixes bug in ApproximateQuantiles`, where you
+ replace `MJDEPRSCAN-XXX` with the appropriate JIRA issue. Best practice is to use the JIRA issue title in the pull
+ request title and in the first line of the commit message.
+- [ ] Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
+- [ ] Run `mvn clean verify` to make sure basic checks pass. A more thorough check will be performed on your pull
+ request automatically.
+- [ ] You have run the integration tests successfully (`mvn -Prun-its clean verify`).
+
+If your pull request is about ~20 lines of code you don't need to sign an
+[Individual Contributor License Agreement](https://www.apache.org/licenses/icla.pdf) if you are unsure please ask on the
+developers list.
+
+To make clear that you license your contribution under
+the [Apache License Version 2.0, January 2004](http://www.apache.org/licenses/LICENSE-2.0)
+you have to acknowledge this by using the following check-box.
+
+- [ ] I hereby declare this contribution to be licenced under
+ the [Apache License Version 2.0, January 2004](http://www.apache.org/licenses/LICENSE-2.0)
+
+- [ ] In any other case, please file
+ an [Apache Individual Contributor License Agreement](https://www.apache.org/licenses/icla.pdf).
