Create CONTRIBUTING.md

CONTRIBUTING.md

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+We welcome pull requests to improve functionality of the library. Please discuss with the team before making a pull request to make sure it fits the scope of the project.
+
+Here are some directions that we would like to go in:
+
+### datasets
+
+- Tuberculosis datasets.
+- Segmentations for existing datasets (pathology masks, organ segmentations, object segmentations)
+ - object-CXR https://jfhealthcare.github.io/object-CXR/
+
+### model
+
+- Models from the CheXpert leaderboard https://stanfordmlgroup.github.io/competitions/chexpert/
+
+One issue here is that they are interchangable with the existing model and are well organized.
+
+### utility functions
+
+Evaluation scripts?
+
+
+