Add installation documentation

docs/installation.md

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+# Installation
+
+### Installing dependencies
+These applications will not be installed with `md-pdf`, so need to be installed through your OS's package manager.
+- `pandoc`
+- `pandoc-citeproc`
+- `wkhtmltopdf` (With QT - [See Here](https://pypi.python.org/pypi/pdfkit))
+
+
+#### Arch Linux
+    yaourt -S pandoc pandoc-citeproc wkhtmltopdf-static
+    
+#### Ubuntu
+    sudo apt install pandoc pandoc-citeproc
+
+To install the correct version of `wkhtmltopdf`, you will need to build it yourself using [this script](https://github.com/JazzCore/python-pdfkit/blob/master/travis/before-script.sh).
+
+#### Windows
+__Note__: Windows is an untested platform, these installation instructions are only theoretical!
+
+Pandoc (and `pandoc-citeproc`) can be installed using the installer found [here](https://github.com/jgm/pandoc/releases/).
+
+`wkhtmltopdf` can be installed from the [official website](https://wkhtmltopdf.org/downloads.html).
+
+
+### Installing `md-pdf`.
+This application isn't available through Pypi directly, but can still be installed using pip.
+    
+    pip install https://github.com/RealOrangeOne/md-pdf
+    
+This should install the rest of the dependencies. To check it installed correctly, you can run this:
+    
+    mdp --help
+If you see the help information, it's installed correctly. If not, please submit an [issue](https://github.com/RealOrangeOne/md-pdf).