add secrets.lua to store api keys for translate shell and weather widget

secrets.lua

@@ -0,0 +1,17 @@
+-------------------------------------------------
+-- Allows to store client specific settings in one place
+--
+-- @author Pavel Makhov
+-- @copyright 2019 Pavel Makhov
+--------------------------------------------
+
+local secrets = {
+
+    -- Yandex.Translate API key - https://tech.yandex.com/translate/
+    translate_widget_api_key = os.getenv('AWW_TRANSLATE_API_KEY') or '<your_key>',
+
+    -- OpenWeatherMap API key - https://openweathermap.org/appid
+    weather_widget_api_key = os.getenv('AWW_WEATHER_API_KEY') or '<your_key>',
+}
+
+return secrets