Added floating action button to add contacts (fixes #40).

android/src/main/res/layout/fragment_contacts.xml

@@ -72,6 +72,16 @@
             android:layout_centerHorizontal="true"
             android:layout_centerVertical="true" />
 
+        <android.support.design.widget.FloatingActionButton
+            android:id="@+id/fab"
+            android:layout_margin="20dp"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:src="@drawable/ic_add_white_24dp"
+            android:layout_alignParentBottom="true"
+            android:layout_alignParentRight="true"
+            android:layout_alignParentEnd="true" />
+
     </RelativeLayout>
 
 </LinearLayout>

android/src/main/scala/com/nutomic/ensichat/fragments/ContactsFragment.scala

@@ -7,6 +7,7 @@ import android.content.{BroadcastReceiver, Context, Intent, IntentFilter}
 import android.net.Uri
 import android.os.Bundle
 import android.preference.PreferenceManager
+import android.support.design.widget.FloatingActionButton
 import android.support.v4.content.{ContextCompat, LocalBroadcastManager}
 import android.support.v7.widget.Toolbar
 import android.view.View.OnClickListener
@@ -70,6 +71,8 @@ class ContactsFragment extends ListFragment with OnClickListener {
     toolbar.setNavigationIcon(R.drawable.ic_launcher)
     title = v.findViewById(R.id.title).asInstanceOf[TextView]
     subtitle = v.findViewById(R.id.subtitle).asInstanceOf[TextView]
+    val fab = v.findViewById(R.id.fab).asInstanceOf[FloatingActionButton]
+    fab.setOnClickListener(this)
     updateConnections()
     v
   }