Add README

README.md

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+To build Gluon, use the following commands after checking out the repository:
+
+    git submodule update --init						# Get other repositories used by Gluon
+    git clone git://github.com/freifunk-gluon/site-ffhl.git site	# Get the Freifunk Lübeck site repository - or use your own!
+    make								# Build Gluon
+
+When building Gluon for the first time, the OpenWRT build environment is prepared. To update the OpenWRT
+environment, e. g. to compile added or changed packages, just use:
+
+    make prepare
+
+The built images can be found in the directory /images.