Resolve "Include setup with conda in README.md"

Closes #128 (closed)

conda-setup.yml

 name: vre-language
-channels:
-  - defaults
-  - conda-forge # Enable package download from conda-forge channel
 dependencies:
   - python=3.9 # Python version must be 3.7 or newer
-  # Core packages:
-  - textx
-  - numpy
-  - pandas
-  - cctbx202208::pint # Required pint-0.19.2 package is provided by cctbx202208 channel
-                      # see: https://anaconda.org/cctbx202208/pint
-  - pint-pandas
-  - fireworks
-  - pyyaml
-  - dill
-  - ase
+  - pip
+  - pip:
+      - -r requirements.txt #user-only (core) installation
+      #- -r requirements_test.txt #developer-mode installation