Update ComputeCanada setup instructions (#179)

docs/setup/setup-cc.md

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+# Setup Capreolus on Compute Canada
+
+This page contains instructions to set up Capreolus on Compute Canada (CC).
+Please follow [this guide](https://github.com/castorini/onboarding/blob/master/docs/cc-guide.md) to create an account on Compute Canada.
+
+This instruction assume the users have anaconda or miniconda installed.
+
+## Capreolus Installation
+To setup, clone the repo and run the following scripts under the top-level capreolus: 
+```bash
+git clone https://github.com/capreolus-ir/capreolus && cd capreolus
+
+module load java/11
+module load python/3.7
+module load scipy-stack
+
+ENVDIR=$HOME/venv/capreolus-env
+virtualenv --no-download $ENVDIR
+source $ENVDIR/bin/activate
+
+pip install tf-models-official==2.5 tensorflow-ranking==0.4.2
+cat requirements.txt | cut -d '#' -f 1  | grep "\S" | xargs -n 1 -i sh -c 'pip install --no-index {} || pip install {}'
+pip install --no-index torch==1.9.0 spacy==2.2.2
+```
+
+## Pre-download Huggingface models 
+In case the server has no internet access, you can use the script `./scripts/download_model.sh` to pre-download huggingface models: 
+```bash
+sh ./scripts/download_model.sh $model_name
+```
+The model will then be downloaded to the current directory. 
+You can then pass the model directory to Capreolus via: 
+```
+task.reranker.pretrained=/path/to/model 
+task.reranker.extractor.tokenizer.pretrained=/path/to/model`
+```
+
+## Pre-download MS MARCO Passage Dataset 
+**After** specifying the `$CAPREOLUS_CACHE` and `$CAPREOLUS_RESULT` 
+(For CC users, they should be set under `/scratch/your_user_name` since the cache and results can take a huge amount of space), 
+run `sh download_data.sh` to pre-download the needed data for MS MARCO Passage dataset.
+```bash
+export CAPREOLUS_CACHE=/scratch/your_username/.capreolus/cache
+export CAPREOLUS_RESULTS=/scratch/your_username/.capreolus/results
+sh ./scripts/download_data.sh
+```