Created Installing (markdown)

Installing.md

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+There are several methods for installing `cheat` on your system.
+
+### pip ###
+`pip` is the recommended installation method for most users. Simply run:
+
+```sh
+[sudo] pip install cheat
+```
+
+### homebrew ###
+To install `cheat` using homebrew, run:
+
+```sh
+brew install cheat
+```
+
+### manually ###
+First, install the dependencies:
+
+```sh
+[sudo] pip install docopt pygments pyxdg
+```
+
+Then clone this repository:
+```sh
+git clone git@github.com:chrisallenlane/cheat.git
+```
+
+Lastly, `cd` into the cloned directory, then run:
+
+```sh
+[sudo] python setup.py install
+```