Create README.md

GoogleCloud/tourmaline/README.md

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+## Tourmaline methods
+We ran Tourmaline workflow with docker interactively: 
+```
+sudo docker run -v $HOME:/data -it aomlomics/tourmaline /bin/bash -c "sh run_tourmaline"
+```
+Where the run_tourmaline script contained the necessary snakemake commands to run the workflow with --jobs 30 (the workflow only uses up to 8 CPUs per rule) and conda as software deployment method. 
+
+Our virtual machine was a n2-standard-16 (16 CPUs, 64 GB RAM) which uses Intel Cascade Lake processors and represents the newest general purpose processors. 
+