Added a README.

README.md

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+[![GoDoc](https://godoc.org/github.com/jacobsa/ogletest?status.svg)](https://godoc.org/github.com/jacobsa/fuse)
+
+This package allows for writing and mounting user-space file systems from Go. It
+is a wrapper around [bazil.org/fuse][bazil], which does the heavy lifting. It
+does not make use the [bazil.org/fuse/fs][bazil-fs] sub-package, which allows
+for something like an object-orientend representation of files and directories,
+and contains a decent amount of canned behavior.
+
+The chief improvements and/or differences from the bazil.org packages are:
+
+ *  A single interface (`FileSystem`) for all of the methods that you might care
+    about.
+
+ *  No surprises in the form of magic/default behaviors. You must provide an
+    implementation for every method in the interface. Embed a
+    `NotImplementedFileSystem` struct to have default implementations that
+    return `ENOSYS`.
+
+ *  Every method, struct, and field is thoroughly documented. This may help you
+    get your bearings in the world of FUSE, the Linux VFS, traditional file
+    system implementations, etc., all of which tend to be very poorly
+    documented.
+
+The very large disadvantage over using the bazil.org packages is that many
+features have not yet been exposed.
+
+[bazil]: http://godoc.org/bazil.org/fuse
+[bazil-fs]: http://godoc.org/bazil.org/fuse/fs