extras: create an empty (sub-)layer for extra or best-effort stuff

Signed-off-by: Denys Dmytriyenko <denys@ti.com>

extras/COPYING.MIT

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+Permission is hereby granted, free of charge, to any person obtaining a copy 
+of this software and associated documentation files (the "Software"), to deal 
+in the Software without restriction, including without limitation the rights 
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
+copies of the Software, and to permit persons to whom the Software is 
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in 
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 
+THE SOFTWARE.

extras/README

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+An "extras" (AKA best-effort) layer for meta-ti
+
+This layer depends on:
+
+URI: git://git.openembedded.org/openembedded-core
+layers: meta
+branch: master
+
+URI: git://git.yoctoproject.org/meta-ti
+layers: meta
+branch: master
+
+
+Send pull requests, patches, comments or questions to meta-ti@yoctoproject.org
+
+Maintainers: Denys Dmytriyenko <denys@ti.com>
+             Koen Kooi <koen@dominion.thruhere.net>

extras/conf/layer.conf

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+# We have a conf and classes directory, append to BBPATH
+BBPATH .= ":${LAYERDIR}"
+
+# We have a recipes directory, add to BBFILES
+BBFILES += "${LAYERDIR}/recipes*/*/*.bb ${LAYERDIR}/recipes*/*/*.bbappend"
+
+BBFILE_COLLECTIONS += "meta-ti-extras"
+BBFILE_PATTERN_meta-ti := "^${LAYERDIR}/"
+BBFILE_PRIORITY_meta-ti = "10"