First draft for gophercloud intro blog post

* URLs will likely change, those are placeholders (at least the one for docs)
So, something like this:

To install gophercloud set your `$GOPATH` environment variable to where you want to install gopher cloud:

```
 mkdir $HOME/go
 export GOPATH=$HOME/go
```
after that, you can install it with the following command:

```
 go get github.com/rackspace/gophercloud
```