Short readme with build instructions

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+## opus, by xiph.org
+
+This package provides Go bindings for the C library libopus, by xiph.org.
+
+Installation is a bit of a mess right now but I'm working on simplifying it.
+Here's the summary:
+
+```sh
+git submodule init
+git submodule update
+make
+cp libopusbuild/lib/libopus.a .
+go build
+```
+
+Now, here's the annoying part: the libopus.a file from the current directory
+must always be present in every directory you use this this package from. So if
+you create a new media player in Go and you include libopus, you must put that
+.a file in your media player project directory.
+
+It can be changed
+(https://groups.google.com/d/msg/golang-nuts/lF5skXi7OD4/SjwQbgju91QJ>) but
+that's on my TODO list for now.