Merge pull request #97 from Azure/dev

re add train-requirements.txt to environments directory

classical/aml-cli-v2/data-science/environment/train-requirements.txt

@@ -0,0 +1,6 @@
+azureml-mlflow==1.38.0
+azureml-sdk==1.38.0
+scikit-learn==0.24.1
+pandas==1.2.1
+joblib==1.0.0
+matplotlib==3.3.3