D17762: Add building instructions using Docker

[Aleix Pol Gonzalez]

apol added inline comments.

INLINE COMMENTS

> README.md:22
> +```
> +docker run -ti --rm -v /tmp:/output kdeorg/android-sdk /opt/helpers/build-generic -DQTANDROID_EXPORTED_TARGET=itinerary-app
> +```

It shouldn't be necessary to pass `-DQTANDROID_EXPORTED_TARGET=itinerary-app`. Do you get an error or something otherwise?

FWIW, it's not necessary for on the binary-factory builds.

REPOSITORY
  R1007 Itinerary - Travel Assistance Application

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D17762

To: dfaure, apol, vkrause
Cc: mlaurent, kde-pim, dvasin, rodsevich, winterz, vkrause, knauss, dvratil
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