docs: add guide to copying and installing the Dev Tools app

<h2 id="additionaldebugging">Debugging and Testing with Dev Tools</h2>

<p>With the Dev Tools application, you can turn on a number of settings that will

make it easier to test and debug your applications. The Dev Tools application is automatically

installed on all system images included with the SDK. The source code for the Dev Tools application

is also provided in the SDK samples so that you may build it and then install the application on any

development device.</p>

<p>With the Dev Tools application, you can enable a number of settings on your device that will

make it easier to test and debug your applications.</p>

<p>The Dev Tools application is installed by default

on all system images included with the SDK, so you can use it with the Android Emulator. If you'd

like to install the Dev Tools application on a real development device, you can copy the

application from your emulator and then install it on your device using ADB. To copy the

application from a running emulator, execute:

</p>

<pre>

adb -e pull /system/app/Development.apk ./Development.apk

</pre>

<p>This copies the .apk file into the current directory. Then install it on your connected device

with:</p>

<pre>

adb -d install Development.apk

</pre>

<p>To get to the development settings page on the emulator, launch the Dev Tools application and

<p>To get started, launch the Dev Tools application and

select Development Settings. This will open the Development Settings page with the

following options (among others):</p>