Add the Transifex configuration file.

.tx/config

+[main]
+host = https://www.transifex.com
+
+[espeak-for-android.stringsxml]
+file_filter = android/res/values-<lang>/strings.xml
+source_lang = en
+trans.en_GB = android/res/values-en-rGB/strings.xml
+trans.es_419 = android/res/values-es-rUS/strings.xml
+trans.he = android/res/values-iw/strings.xml
+trans.pt_PT = android/res/values-pt-rPT/strings.xml
+trans.zh_CN = android/res/values-zh-rCN/strings.xml
+trans.zh_TW = android/res/values-zh-rTW/strings.xml
+