add 'installing apt', corresponding dependency tree

Before we can install `dpkg`, we must first complete the dependencies needed for it to compile using the toolchain located in our `/tools` directory. The following figure shows the dependencies needed for `dpkg` to compile properly:  

<center>![Figure 1.0 The dpkg dependency tree](https://cdn.rawgit.com/scottwilliambeasley/debian-from-scratch/master/images/dpkg.svg)</center>

#####Figure 1.0 - The dpkg dependency tree

<center>![](https://cdn.rawgit.com/scottwilliambeasley/debian-from-scratch/master/images/dpkg.svg)</center>

#####Figure 1 - The dpkg dependency tree

All of of these dependencies, only `gettext` has already been installed on our system. Thus we must compile all of these one by one until such a time comes where we have satisfied all of `dpkg`'s dependencies.

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Notice how all of the prerequisite software needed to compile `dpkg` is still installed in `/tools`, while the `dpkg` binary itself is installed in the `/usr` directory (specifically `/usr/bin`), its configuration files being placed in `/etc`, and its local state directory (which holds the dpkg database and other files) will be located within `/var`(specifically `/var/lib/dpkg`).

###Installing apt

Before we can install `apt`, and use this to automatically install the most of the rest of our system software, we have to install its immediate dependencies on our target system first.

![](https://cdn.rawgit.com/scottwilliambeasley/debian-from-scratch/master/images/apt-dependencies.svg)

#####Figure 2 - The apt dependency tree, one level deep

Each of these immediate dependencies has their own set of dependencies to fulfill. We shall start by completing the dependency tree for `debian-archive-keyring`. Unlike the compilation process needed to install `dpkg`, the process we now use to install software is by installing .`deb` files using `dpkg`.