docs: Added missing instructions for copying the Google Play Services library project.

<div class="select-ide studio">

<p>To make the Google Play services APIs available to your app:</p>

<ol>

  <li>Open the <code>build.gradle</code> file inside your application module directory.

      <p class="note"><strong>Note:</strong> Android Studio projects contain a top-level

</div><!-- end studio -->

<div class="select-ide eclipse">

<p>To make the Google Play services APIs available to your app:</p>

<ol>

  <li>Copy the library project at <code>&lt;android-sdk&gt;/extras/google/google_play_services/libproject/google-play-services_lib/</code> to the location where you maintain your Android app projects.</li>

  <li>Import the library project into your Eclipse workspace. Click

    <b>File > Import</b>, select <b>Android > Existing Android Code into

Workspace</b>, and browse to the copy of the library project to import it.</li>

  <li>In your app project, reference Google Play services library project. See

    <a href="{@docRoot}tools/projects/projects-eclipse.html#ReferencingLibraryProject">Referencing a Library Project for Eclipse</a> for more information on how to

    do this.

  <p class="note"><strong>Note:</strong> You should be referencing a copy of the

    library that you copied to your development workspace—you should not

    reference the library directly from the Android SDK directory.</p>

  </li>

  <li>After you've added the Google Play services library as a dependency for your app project,

    open your app's manifest file and add the following tag as a child of the

    <a href="{@docRoot}guide/topics/manifest/application-element.html">{@code &lt;application>}</a>

element:

    <pre>

<meta-data android:name="com.google.android.gms.version"

        android:value="@integer/google_play_services_version" />

    </pre>

  </li>

</ol>

<div class="select-ide eclipse other">

<p>Once you've set up your project to reference the library project,

you can begin developing features with the

<a href="{@docRoot}reference/gms-packages.html">Google Play services APIs</a>.</p>

<p>To make the Google Play services APIs available to your app, you must reference the library

project you created in step 4 of the <a href="#Install">installation instructions</a>.</p>

<p>See the <a href="{@docRoot}tools/projects/projects-eclipse.html#ReferencingLibraryProject"

>Referencing a Library Project for Eclipse</a> or <a

href="{@docRoot}tools/projects/projects-cmdline.html#ReferencingLibraryProject">Referencing a

Library Project on the Command Line</a> for more information on how to do this.</p>

</div><!-- end eclipse -->

<div class="select-ide other">

<p>To make the Google Play services APIs available to your app:</p>

<ol>

  <li>Copy the library project at <code>&lt;android-sdk&gt;/extras/google/google_play_services/libproject/google-play-services_lib/</code> to the location where you maintain your Android app projects.</li>

  <li>In your app project, reference Google Play services library project. See

    <a href="{@docRoot}tools/projects/projects-cmdline.html#ReferencingLibraryProject">Referencing

    a Library Project on the Command Line</a> for more information on how to do this.

    <p class="note"><strong>Note:</strong>

You should be referencing a copy of the library that you copied to your development

workspace&mdash;you should not reference the library directly from the Android SDK directory.</p>

<p>After you've added the Google Play services library as a dependency for your app project,

open your app's manifest file and add the following tag as a child of the <a

href="{@docRoot}guide/topics/manifest/application-element.html">{@code &lt;application>}</a>

element:

  </li>

  <li>After you've added the Google Play services library as a dependency for

    your app project, open your app's manifest file and add the following tag as

    a child of the

    <a href="{@docRoot}guide/topics/manifest/application-element.html">{@code &lt;application>}</a> element:

    <pre>

<meta-data android:name="com.google.android.gms.version"

        android:value="@integer/google_play_services_version" />

    </pre>

  </li>

</ol>

<p>Once you've set up your project to reference the library project,

you can begin developing features with the

<a href="{@docRoot}reference/gms-packages.html">Google Play services APIs</a>.</p>

</div><!-- end eclipse and other -->

</div><!-- end other -->

<h2 id="Proguard">Create a Proguard Exception</h2>