update: README.md

Author: f-allian

dafni/README.md

@@ -5,7 +5,7 @@ to upload the framework onto [DAFNI](https://www.dafni.ac.uk).
 - It is **not** recommended to install the causal testing framework using Docker, and should only be installed
   using [PyPI](https://pypi.org/project/causal-testing-framework/).
 
-### Folders
+### Directory Hierarchy
 
 - `data` contains two sub-folders (the structure is important for DAFNI).
   - `inputs` is a folder that contains the input files that are (separately) uploaded to DAFNI.
@@ -15,18 +15,19 @@ to upload the framework onto [DAFNI](https://www.dafni.ac.uk).
        `node [datatype="int", typestring="input"]`. The `datatype` key specifies the datatype of the causal variable
        as a string (e.g. `"int"`, `"str"`) and the `typestring` key specifies its typestring, which is also a string 
        representing the variable type (e.g. `"input"` or `"output"`).
-    - `runtime_data.csv` is a csv file that contains the runtime data.
+    - `runtime_data.csv` is the `.csv` file that contains the runtime data.
 
   - `outputs` is a folder where the `causal_tests_results.json` output file is created.
 
 ### Docker files
-- `main_dafni.py` is the entry-point to the causal testing framework that is used by Docker.
 - `model_definition.yaml` is the model metadata that is required to be uploaded to DAFNI.
-- `.env` is an example of a configuration file containing the environment variables. This is only required
-    if using `docker-compose` to build the image. 
-- `Dockerfile` is the main blueprint that builds the image.
-- `.dockerignore` tells the Dockerfile which files to not include in the image.
+- `Dockerfile` is the main blueprint that builds the image. The main command calls the `causal_testing` module, 
+   with specified paths for the DAG, input runtime data, test configurations, and the output filename as defined above. 
+   This command is identical to that referenced in the main [README.md](../README.md) file.
 - `docker-compose.yaml` is another method of building the image and running the container in one line. 
    Note: the `.env` file that contains the environment variables for `main_dafni.py` is only used here.
+- `.dockerignore` tells the Dockerfile which files to not include in the image.
+- `.env` is an example of a configuration file containing the environment variables. This is only required
+    if using `docker-compose` to build the image.