Revert "Delete environment.yml"

This reverts commit 49fa2841

environment.yml

+name: my-environment
+channels:
+  - conda-forge
+dependencies:
+  - python>3.7
+  - notebook>5.2
+  - numpy
+  - pandas
+  - seaborn
+  - matplotlib
+  - sympy
+  - math
+  - random  
\ No newline at end of file