Created site.mk for example config

docs/site-example/site.mk

+##	gluon site.mk makefile example
+
+##	GLUON_SITE_PACKAGES
+#		specify gluon/openwrt packages to include here
+GLUON_SITE_PACKAGES := \
+  gluon-alfred \
+  gluon-announced \
+  gluon-ath9k-workaround \
+  gluon-autoupdater \
+  gluon-config-mode \
+  gluon-ebtables-filter-multicast \
+  gluon-ebtables-filter-ra-dhcp \
+  gluon-luci-admin \
+  gluon-luci-autoupdater \
+  gluon-luci-portconfig \
+  gluon-next-node \
+  gluon-mesh-batman-adv \
+  gluon-mesh-vpn-fastd \
+  gluon-radvd \
+  gluon-status-page \
+  iwinfo \
+  iptables \
+  haveged
+
+
+##	DEFAULT_GLUON_RELEASE
+#		version string to use for images
+#		gluon relies on
+#			opkg compare-versions "$1" '>>' "$2"
+#		to decide if a version is newer or not.
+DEFAULT_GLUON_RELEASE := 0.3+0-exp$(shell date '+%Y%m%d')
+
+
+##	GLUON_RELEASE
+#		call make with custom GLUON_RELEASE flag, to use your own release version scheme.
+#		e.g.:
+#			$ make images GLUON_RELEASE=23.42+5
+#		would generate images named like this:
+#			gluon-ff%site_code%-23.42+5-%router_model%.bin
+
+# Allow overriding the release number from the command line
+GLUON_RELEASE ?= $(DEFAULT_GLUON_RELEASE)
+
+# Default priority for updates.
+GLUON_PRIORITY ?= 0