Create pull_request_template.md

.github/pull_request_template.md

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+# Objective
+
+- Describe the objective or issue this PR addresses.
+- If you're fixing a specific issue, say "Fixes #X".
+
+## Solution
+
+- Describe the solution used to achieve the objective above.
+
+## Code generation
+
+- Most code in glam is generated by an offline tool.
+- Are you modify generated code?
+- Have you modified the templates and run the code generator?
+
+See https://github.com/bitshifter/glam-rs/blob/main/codegen/README.md for details.
+
+## Testing and linting
+
+- Your PR should include tests for any bug fixes or new features.
+- `cargo test` and `cargo clippy` must pass.
+
+You can run most of glam's tests locally by running the `build_and_test_features.sh` script.
+
+## Breaking changes
+
+*This section is optional. If there are no breaking changes, you can delete this section.*
+
+- If this PR is a breaking change describe how a user might need to migrate their code.
+- Simply adding new functionality is not a breaking change.
+- Fixing behavior that was definitely a bug is not a breaking change.