Tap & Pay - Give 'learn more' a URL

Settings resources states that this should be overlayed in product config.
Due to lack of another central source for info (note: need wiki page), point
to Google Support page.

Change-Id: Ic472951b98a409583571442909a638991396d538

overlay/common/packages/apps/Settings/res/values/strings.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright 2015 The CyanogenMod Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<resources>
+    <!-- Help URL, Tap & pay [DO NOT TRANSLATE] -->
+    <string name="help_url_nfc_payment" translatable="false">https://support.google.com/wallet/answer/1347934</string>
+</resources>
+