Add requirements files for conda, pip.

requirements_conda.txt

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+# This file may be used to create an environment using:
+# $ conda create --name astrophot -c conda-forge --file requirements_conda.txt
+# platform: linux-64
+astropy
+cudatoolkit
+h5py
+ipykernel
+jupyter
+matplotlib
+numpy
+pandas
+pyyaml
+pyarrow
+scipy
+requests
+tqdm

requirements_pip.txt

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+# These packages are not available through conda
+# and will need to be pip installed.
+# Also need to manually download and install the webbpsf data files
+# https://webbpsf.readthedocs.io/en/latest/installation.html#installing-the-required-data-files
+#
+astrophot
+pyro-ppl
+torch
+webbpsf