Add pull request template

Fixes: #794

.github/pull_request_template.md

@@ -0,0 +1,27 @@
+### Description
+
+_Short summary of what is the issue and the solution._
+
+**This is a new feature**:
+
+_Do the changes in this PR implement a new feature?_
+
+**I have updated the documentation to reflect these changes**:
+
+_Are there documentation changes required as a result of these changes? See
+https://github.com/LibreTime/libretime/wiki/Documentation-Requirements_
+
+### Testing Notes
+
+**What I did:**
+
+_What did you do to validate this PR?_
+
+**How you can replicate my testing:**
+
+_How can the reviewer validate this PR?_
+
+### **Links**
+
+_Issues links or other related resources. Use the line Closes: #bug_number to
+link a bug in the issue tracker._