Proposed PR template (#458)

* Proposed PR template

* Apply suggestions from code review

.github/pull_request_template.md

@@ -1,9 +1,25 @@
-## Issues
+Resolves #
 
-<!-- paste an issue link here from github/gitlab -->
+### Problem
 
-## Changelog
+<!---
+  Describe the problem this PR is solving. What is the application state
+  before this PR is merged?
+-->
 
+### Solution
+
+<!---
+  Describe the way this PR solves the above problem. Add as much detail as you
+  can to help reviewers understand your changes. Include any alternatives and
+  tradeoffs you considered.
+-->
+
+### Checklist
+
+- [ ] I have run this code, and it appears to resolve the stated issue.
+- [ ] This PR does not reduce total test coverage
+- [ ] This PR has no user interface changes or has already received approval from product management to change the interface.
 - [ ] Does this change require a Terraform schema change?
   - If so what is the ticket or PR #
-- [ ] Make a `changie` entry
+- [ ] Make a [changie](https://github.com/OpsLevel/opslevel-go/blob/main/CONTRIBUTING.md#changie-change-log-generation) entry that explains the customer facing outcome of this change