Updated README

README.md

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 [![pipeline status](https://gitlab.linphone.org/BC/public/linphone-android/badges/master/pipeline.svg)](https://gitlab.linphone.org/BC/public/linphone-android/commits/master)
 
-Linphone is a free VoIP and video softphone based on the SIP protocol.
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+Linphone is an open source softphone for voice and video over IP calling and instant messaging.
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+It is fully SIP-based, for all calling, presence and IM features.
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+General description is available from [linphone web site](https://www.linphone.org/technical-corner/linphone)
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+### License
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+Copyright © Belledonne Communications
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+Linphone is dual licensed, and is available either :
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+ - under a [GNU/GPLv3 license](https://www.gnu.org/licenses/gpl-3.0.en.html), for free (open source). Please make sure that you
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+understand and agree with the terms of this license before using it (see LICENSE file for
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+details).
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+ - under a proprietary license, for a fee, to be used in closed source applications. Contact
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+[Belledonne Communications](https://www.linphone.org/contact) for any question about costs and services.
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+### Documentation
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+- Supported features and RFCs : https://www.linphone.org/technical-corner/linphone/features
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+- Linphone public wiki : https://wiki.linphone.org/xwiki/wiki/public/view/Linphone/
 
 # What's new