Adding build.gradle to external/libphonenumber, with files needed
for E164 conversion, utility methods.

Change-Id: I701aedf2c618d60c809c5bb4bbe3586335b6c8a7
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..df66d60
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,22 @@
+apply plugin: 'java'
+
+sourceSets {
+    main {
+        java {
+            srcDirs = ['libphonenumber/src']
+            include 'com/google/i18n/phonenumbers/AlternateFormatsCountryCodeSet.java',
+                    'com/google/i18n/phonenumbers/AsYouTypeFormatter.java',
+                    'com/google/i18n/phonenumbers/CountryCodeToRegionCodeMap.java',
+                    'com/google/i18n/phonenumbers/MetadataLoader.java',
+                    'com/google/i18n/phonenumbers/MetadataManager.java',
+                    'com/google/i18n/phonenumbers/NumberParseException.java',
+                    'com/google/i18n/phonenumbers/Phonemetadata.java',
+                    'com/google/i18n/phonenumbers/Phonenumber.java',
+                    'com/google/i18n/phonenumbers/PhoneNumberMatch.java',
+                    'com/google/i18n/phonenumbers/PhoneNumberMatcher.java',
+                    'com/google/i18n/phonenumbers/PhoneNumberUtil.java',
+                    'com/google/i18n/phonenumbers/RegexCache.java',
+                    'com/google/i18n/phonenumbers/ShortNumbersRegionCodeSet.java'
+        }
+    }
+}