Update README.md

Author: fpistm

README.md

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 Storage for Arduino Boards Manager JSON and package files etc
 
 For more information see the [Wiki](https://github.com/stm32duino/wiki/wiki/). Mainly the [Getting Started page](https://github.com/stm32duino/wiki/wiki/Getting-Started).
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+## Troubleshooting
+
+If you have any issue to download/use a package, you could [file an issue on Github](https://github.com/stm32duino/BoardManagerFiles/issues/new).
+
+Or submit a topic on the [stm32duino forum](http://stm32duino.com):
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+ * questions on the [STM32 Core](http://stm32duino.com/viewforum.php?f=48)
+
+ * bugs/enhancements on the [STM core: Bugs and enhancements](http://stm32duino.com/viewforum.php?f=49)