Add PR template (#347)

.github/pull_request_template.md

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+## Issue resolution
+- Closes #<ISSUE_NUMBER_HERE>
+
+Select one: This pull request is...
+- [ ] a bug fix: increment the patch version
+- [ ] a small improvement: increment the minor version
+- [ ] an incompatible (non-backwards compatible) API change: increment the major version
+
+## 1. Does this do what we want it to do?
+
+Objectives:
+- Objective 1
+- Objective 2
+- ...
+- Objective n
+
+Required:
+- [ ] Product Management: I have confirmed with the stakeholders that the objectives above are correct and complete.
+- [ ] Testing: I have added at least one automated test. Every objective above is represented in at least one test.
+- [ ] Testing: I have considered likely and/or severe edge cases and have included them in testing.
+
+If applicable:
+- [ ] Testing: this pull request adds at least one new possible command line option. I have tested using this option with and without any other option that may interact with it.
+
+## 2. Are the implementation details accurate & efficient?
+
+Required:
+- [ ] Logic: I have visually inspected the entire pull request myself.
+- [ ] Logic: I have left GitHub comments highlighting important pieces of code logic. I have had these code blocks reviewed by at least one other team member.
+
+If applicable:
+- [ ] Dependencies: This pull request introduces a new dependency. I have discussed this requirement with at least one other team member. The dependency is noted in `zstash/conda`, not just an `import` statement.
+
+## 3. Is this well documented?
+
+Required:
+- [ ] Documentation: by looking at the docs, a new user could easily understand the functionality introduced by this pull request.
+
+## 4. Is this code clean?
+
+Required:
+- [ ] Readability: The code is as simple as possible and well-commented, such that a new team member could understand what's happening.
+- [ ] Pre-commit checks: All the pre-commits checks have passed.
+
+If applicable:
+- [ ] Software architecture: I have discussed relevant trade-offs in design decisions with at least one other team member. It is unlikely that this pull request will increase tech debt.