clisops: conda installation quick instructions

[agstephens]

Quick instructions for installation of clisops (with xesmf):

# more clisops-install/installer.sh
mkdir -p ~/clisops-install
cd ~/clisops-install/

wget https://repo.anaconda.com/miniconda/Miniconda3-py38_4.10.3-Linux-x86_64.sh
bash Miniconda3-py38_4.10.3-Linux-x86_64.sh -b -p ~/clisops-install/miniconda

export PATH=${PWD}/miniconda/bin:$PATH

git clone https://github.com/roocs/clisops
cd clisops/
git checkout regrid-main-ag

time conda env create -f environment.yml
# Took 7 minutes
source activate clisops
pip install -e ".[dev]"
#pip install --upgrade git+https://github.com/pangeo-data/xESMF.git
pip install pangeo-xesmf==0.6.0

echo "Do edits and run tests."
pytest --cov tests