Create virtual_environment_info.md

Fix for #116

Author: pensivebrian

doc/virtual_environment_info.md

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+Virtual Environment
+========================================
+
+## What is a virtual environment?
+    - A isolated Python environment that is installed into a directory.
+    - Maintains it's own copy of Python and pip (Python's package manager).
+    - When activated all Python operations will route to the Python interpreter within the virtual environment.
+
+## What are the benefits?
+    - Keeps your global site-packages directory clean and manageable.
+    - Keeps system or user installed Python and it's libraries untouched.
+    - Solves the problem of “Project X depends on version 1.x but, Project Y needs 4.x”.
+    - Development will not interfere with the System or the user's python. 
+    - All libraries installed in the virtual environment will only be used within that environment.
+
+## How to install?
+
+    $ pip install virtualenv
+
+## How to create a virtual environment?
+In current directory:
+    
+    python -m venv .
+
+In a subdirectory that does not exist:
+
+    python -m venv ./new_dir
+
+## How to activate a virtual environment?
+##### Windows
+```
+new_dir\scripts\activate.bat
+```
+##### MacOS/Linux (bash)
+```
+. new_dir/bin/activate
+```
+## How to deactivate a virtual environment?
+##### Windows
+```
+<clone_root>\env\scripts\deactivate.bat
+```
+##### MacOS/Linux (bash)
+```
+deactivate
+```