Add pull request template.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,6 +1,6 @@
 ---
 name: Bug report
-about: Report issues of Opentracks features
+about: Report issues of OpenTracks features
 title: ''
 labels: potential bug
 assignees: ''

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,10 @@
+# Thanks for your contribution.
+
+**Describe the pull request**
+A clear and concise description of what the pull request changes/adds.
+
+**Link to the the issue**
+(If available): The link to the issue that this pull request solves.
+
+**License agreement**
+By opening this pull request, you are providing your contribution under the _Apache License 2.0_ (see [LICENSE.md](LICENSE.md)).