meta-ruby: add empty layer

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-ruby/conf/layer.conf

@@ -0,0 +1,9 @@
+# We have a conf and classes directory, append to BBPATH 
+BBPATH .= ":${LAYERDIR}"
+
+# We have a recipes directory, add to BBFILES
+BBFILES += "${LAYERDIR}/recipes-*/*/*.bb ${LAYERDIR}/recipes-*/*/*.bbappend"
+
+BBFILE_COLLECTIONS += "ruby-layer"
+BBFILE_PATTERN_ruby-layer := "^${LAYERDIR}/"
+BBFILE_PRIORITY_ruby-layer = "7"