Update README with instructions

README.md

@@ -4,9 +4,12 @@ This project uses Django 1.11 and python >= 3.5
 
 ## Requirements
 
-To run the project, start a virtual environment and install
-requirements.txt requirements-dev.txt contains additional dependencies
-for development
+To run the project, start a virtual environment:
+
+    $ virtualenv -p python3 env
+    $ source ./env/bin/activate
+
+and install all required Python dependencies for development and build:
 
     $ pip install -r requirements.txt
     $ pip install -r requirements-dev.txt
@@ -17,7 +20,7 @@ webpack (to compile local assets)
 
     $ npm install -g yarn webpack
     $ yarn install
-    $ webpack
+    $ yarn run webpack
 
 In case you want to use the fixtures, you will need to install (git-lfs)[https://git-lfs.github.com/].