[doc] added a bit details to initial setup (#14)

.gitignore

 *~
+*.swp
+
 *.pyc
+*.pyo
+
 .mypy_cache/
 *.egg-info/

CONTRIBUTING.md

@@ -3,7 +3,9 @@ We want to make contributing to this project as easy and transparent as
 possible.
 
 ## Our Development Process
-Minor changes and improvements will be released on an ongoing basis. Larger changes (e.g., changesets implementing a new paper) will be released on a more periodic basis.
+Minor changes and improvements will be released on an ongoing basis. Larger
+changes (e.g., changesets implementing a new paper) will be released on a
+more periodic basis.
 
 ## Pull Requests
 We actively welcome your pull requests.
@@ -29,19 +31,61 @@ Facebook has a [bounty program](https://www.facebook.com/whitehat/) for the safe
 disclosure of security bugs. In those cases, please go through the process
 outlined on that page and do not file a public issue.
 
+## Environment setup
+
+```
+~$ python3 -m venv venv2
+~$ source venv2/bin/activate
+(venv2) ~$ cd git/fairscale/
+(venv2) ~/git/fairscale $ pip3 install -r requirements-test.txt
+```
+
 ## Coding Style
-* In your editor, install the [editorconfig](https://editorconfig.org/) extension which should ensure that you are following the same standards as us.
+* In your editor, install the [editorconfig](https://editorconfig.org/) extension
+  which should ensure that you are following the same standards as us.
 * Ideally, run black and isort before opening up your PR.
 
 ```
-black ./(mmf|tests|tools)/**/*.py
-isort -rc (mmf|tests|tools)
+black .
+isort
+flake8
 ```
 * Read the [editorconfig](.editorconfig) file to understand the exact coding style preferences.
 
+## Testing
+
+### Static analysis
+
+```
+mypy .
+```
+
+### Unit tests
+
+```
+pytest
+```
+
+### CircleCI status
+
+From your PR page, you can expand on the CircleCI results. For GPU test, you should see
+what CI has run, like:
+
+```
+...
+----- generated xml file: /home/circleci/fairscale/test-results/junit.xml ------
+================== 217 passed, 2 xfailed in 218.74s (0:03:38) ==================
+CircleCI received exit code 0
+```
+
+The number of passed and failed should give you an idea on whether your local
+test was the same or not.
+
 ## Commit Guidelines
 
-We follow the same guidelines as AngularJS. Each commit message consists of a **header**, a **body** and a **footer**.  The header has a special format that includes a **type**, and a **subject**:
+We follow the same guidelines as AngularJS. Each commit message consists of a **header**,
+a **body** and a **footer**.  The header has a special format that includes a **type**,
+and a **subject**:
 
 ```
 [<type>] <subject>