Update README

Signed-off-by: Andreas Müller <schnitzeltony@gmail.com>

README.md

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+OE layer to desktop environments based on Qt5
+
+Layer dependencies:
+----------------------
+see conf/layer.conf
+
+
+URI: git://git.openembedded.org/openembedded-core
+branch: master
+revision: HEAD
+
+URI: git://github.com/meta-qt5/meta-qt5.git
+branch: master
+revision: HEAD
+
+URI: git://git.openembedded.org/meta-openembedded
+branch: master
+revision: HEAD
+
+
+Contributing
+------------
+* Submit any patches against the `meta-qt5-extra` layer by using the GitHub pull-request feature.
+
+
+Policies
+--------
+* Please do not send private emails to maintainers. For questions/suggestions.. use GitHub issues.
+* Pull requests should follow [1] with the following additions
+  * Use 4 spaces for indention always
+  * For splitting of long list values use four-space indentation on sucessive lines and prefer the closing quote as the first character ([1] second example)
+  * Patches fixing issues for musl, clang or gold-linker are accepeted only with upstream-status "Applied" or "Backport"
+
+
+Maintainers
+-----------
+
+Layer maintainer: Andreas Müller <schnitzeltony@gmail.com>
+
+
+
+[1] https://www.openembedded.org/wiki/Styleguide