added README for curweather

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+Current Weather
+===============
+
+If activated by your user this addon adds a widget to the users network tab
+sidebar showing current weather informations from
+[OpenWeatherMap](http://openweathermap.org). The user can configure the
+location as e.g. *Berlin,DE* or the zip code "14476,DE".
+
+The language for the request at OpenWeatherMap is set to the UI language of
+friendica. If the string for the description of the current weather conditions
+is available in this language depends on OpenWeatherMap.
+
+**You should get an APPID from OpenWeatherMap if you want to use this widget.**
+You can register [here](http://openweathermap.org/register).
+
+Credits
+-------
+
+* Tony Baldvin wrote the original addon for Friendica
+* Fabio Comuni
+* Tobias Diekershoff switched the sources to OpenWeatherMap after the original
+  provider turned off support for locations outside of the USA.
+
+To access the API of OpenWeatherMap the library
+[OpenWeatherMap-PHP-Api](https://github.com/cmfcmf/OpenWeatherMap-PHP-Api) by
+Christian Flach is used (MIT license).
+