Add ReadMe for requirements installation

Author: mdmintz

help_docs/requirements_installation.md

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+### Installation Instructions for Python, pip, brew, git, and virtualenv (or virtualenvwrapper)
+
+
+#### [Python 2.7](https://www.python.org/downloads/)
+
+If you're a MAC user, that should already come preinstalled on your machine. Although Python 3 exists, you'll want Python 2 (both of these major versions are being improved in parallel). Python 2.7.10 is the one I've been using on my Mac.
+
+If you're a WINDOWS user, [download the latest 2.* version from here](https://www.python.org/downloads/release/python-2710/).
+
+#### [Pip](https://en.wikipedia.org/wiki/Pip_%28package_manager%29)
+
+If "pip" did not come with your Python installation, you can [GET PIP HERE](https://pip.pypa.io/en/latest/installing/), and make sure it's on your path.
+
+#### [Homebrew](http://brew.sh/) + [Git](http://git-scm.com/) (OPTIONAL)
+
+(NOTE: You can download the SeleniumBase repository right from GitHub and skip all the git-related commands. That's probably the fastest way if you want to quickly get a live demo of this tool up and running.)
+
+```bash
+ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
+brew update
+brew install git
+```
+
+(WINDOWS users: Skip the Homebrew part and [download Git here](http://git-scm.com/download).)
+
+#### [Virtualenv](http://virtualenv.readthedocs.org/en/latest/) or [Virtualenvwrapper](http://virtualenvwrapper.readthedocs.org/en/latest/)
+
+Mac: (The old regular way):
+
+```bash
+sudo easy_install virtualenv
+```
+
+Mac: (The new fancy way):
+
+```bash
+sudo easy_install virtualenvwrapper
+```
+
+Windows:
+
+```bash
+pip install virtualenv
+```