Created by: AGlass0fMilk
This commit adds the extras folder to the .mbedignore file. Some code in the extras folder causes build failures when compiling for Mbed OS (shown below):
[Error] Issue1189.cpp@12,8: 'ArduinoJson6173_71::JsonDocument::JsonDocument(const ArduinoJson6173_71::JsonDocument&)' is private within this context
[Error] Issue1189.cpp@12,8: 'ArduinoJson6173_71::JsonDocument::~JsonDocument()' is protected within this context
Among other errors. Simply ignoring this directory from the Mbed-OS build is sufficient to fix this problem.