work on readme

README.md

@@ -27,6 +27,8 @@ pip install -e .
 
 ## Usage
 
+### In a virtual environment
+
 A command line interface is exposed with the package. For example, this code snippet will run a cut-down version of a "days above temperature" indicator and write the output to `$HOME/hazard_example` :
 
 ```
@@ -35,6 +37,23 @@ mkdir -p $HOME/hazard_example
 os_climate_hazard days_tas_above_indicator --store $HOME/hazard_example
 ```
 
+### In a docker container
+
+First, build the image. 
+
+```
+docker build -t os-hazard-indicator -f dockerfiles/Dockerfile .
+```
+
+Then, you can run an example the following way. In the example, we save the data locally to /data/hazard-test-container in the container. To have access to the output once the container finished running, we are mounting `/data` from the container to `$HOME/data` locally. 
+
+```
+docker run -it -v $HOME/data:/data os-hazard-indicator os_climate_hazard days_tas_above_indicator --store /data/hazard-test-container
+```
+
+### In a CWL (Common Workflow Language) workflow
+
+
 # Contributing
 
 Patches may be contributed via pull requests from forks to