add changelog and PR template

.github/PULL_REQUEST_TEMPLATE.md

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+## Describe your changes
+
+<!-- Describe your changes  -->
+
+## Checklist before requesting a review
+- [ ] I have performed a self-review of my code
+
+- Check the correct box. Does this PR contain:
+  - [ ] Breaking changes
+  - [ ] New functionality (new method, new metric, ...)
+  - [ ] Major changes
+  - [ ] Minor changes
+  - [ ] Bug fixes
+
+- [ ] Proposed changes are described in the CHANGELOG.md
+
+- [ ] CI Tests succeed and look good!

CHANGELOG.md

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+# task-dge-perturbation-prediction 0.1.0
+
+Initial release of the DGE Perturbation Prediction task. Initial components:
+
+* `src/task/process_dataset`: Compute the DGE data from the raw single-cell counts using Limma.
+* `src/task/control_methods`: Baseline control methods: sample, ground_truth, baseline_zero.
+* `src/task/methods`: DGE perturbation prediction methods: random_forest.
+* `src/task/metrics`: Evaluation metrics: mean_rowwise_rmse.
+
+