Uploaded minimal environment-setup .yml file. Currently no precise versioning...

Uploaded minimal environment-setup .yml file. Currently no precise versioning of packages specified, so it might eventually break 

structure_tensor_min_env.yml

+name: st-env
+
+dependencies:
+    - python
+    - ipython
+    - jupyterlab
+    - matplotlib
+    - numpy
+    - scipy
+    - scikit-image
+    - spyder
+    - pip
+    - pip:
+        - structure-tensor