Create PULL_REQUEST_TEMPLATE.md

Author: Kamil A. Kaczmarek

PULL_REQUEST_TEMPLATE.md

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+## Pull Request template to [Santander Value Prediction](https://www.kaggle.com/c/santander-value-prediction-challenge) Open Solution
+
+### Code contributions
+Major - and most appreciated - contribution is pull request with feature or bug fix. Each pull request initiates discussion about your code contribution.
+
+Each pull request should be provided with minimal description about its contents.
+#
+
+Thanks!
+
+Jakub & Kamil,
+
+_core contributors to the minerva.ml_