Resolves #12: Formatting with black

.gitignore

@@ -6,3 +6,5 @@ temp/
 example_models/Si/models/GAP/*
 !example_models/Si/models/GAP/README
 .DS_Store
+*.eggs
+*.egg-info

README.md

@@ -92,3 +92,27 @@ directory. This routine loads up a file called `bulk.xyz` from the same test dir
 (this is why the full path name of the `test.py` script has to be
 passed as the first argument), and calculates the Energy-Volume curve
 of that structure, and also computes the elastic constants. 
+
+Install
+-------
+
+To use `testingframework` as a module, go to the git_dir and run
+
+```bash
+pip install -e .
+```
+ `-e` command ensures that changes to the scirpts will be kept up do date upon import. 
+ Now utilities can be importes as `from testingframework.share.utilities`
+
+
+Formatting
+----------
+
+The git repo is formatted using `black`. Install `black` using
+```bash
+pip install black
+# or 
+conda install -c conda-forge black
+```
+
+To [use black](https://www.freecodecamp.org/news/auto-format-your-python-code-with-black/) simpy do: `black file_to_format.py` or use `black *` to format whole direcotries, or whole repository. The easiest way to use black is by integrating it into your favorite ediotr: [for VS Code](https://dev.to/adamlombard/how-to-use-the-black-python-code-formatter-in-vscode-3lo0), [for Jupyter Noteooks](https://github.com/drillan/jupyter-black).