Add hello example.

example/hello/Makefile

+include $(GOROOT)/src/Make.inc
+
+TARG=hello
+GOFILES=hello.go
+
+DEPS=../../fuse
+
+include $(GOROOT)/src/Make.cmd

example/hello/hello.go

+// A Go mirror of libfuse's hello.c 
+
+package main
+
+import (
+	"flag"
+	"log"
+	"github.com/hanwen/go-fuse/fuse"
+	"os"
+)
+
+type HelloFs struct {
+	fuse.DefaultFileSystem
+}
+
+func (me *HelloFs) GetAttr(name string) (*os.FileInfo, fuse.Status) {
+	switch name {
+	case "file.txt":
+		return &os.FileInfo{
+			Mode: fuse.S_IFREG | 0644, Size: int64(len(name)),
+		}, fuse.OK
+	case "":
+		return &os.FileInfo{
+			Mode: fuse.S_IFDIR | 0755,
+		}, fuse.OK
+	}
+	return nil, fuse.ENOENT
+}
+
+func (me *HelloFs) OpenDir(name string) (c chan fuse.DirEntry, code fuse.Status) {
+	if name == "" {
+		c = make(chan fuse.DirEntry, 1)
+		c <- fuse.DirEntry{Name: "file.txt",Mode: fuse.S_IFREG}
+		close(c)
+		return c, fuse.OK
+	}
+	return nil, fuse.ENOENT
+}
+
+func (me *HelloFs) Open(name string, flags uint32) (file fuse.File, code fuse.Status) {
+	if name != "file.txt" {
+		return nil, fuse.ENOENT
+	}
+	if flags & fuse.O_ANYWRITE != 0 {
+		return nil, fuse.EPERM
+	}
+	return fuse.NewReadOnlyFile([]byte(name)), fuse.OK
+}
+
+func main() {
+	if len(flag.Args()) < 1 {
+		log.Fatal("Usage:\n  hello MOUNTPOINT")
+	}
+	state, conn, err := fuse.MountFileSystem(flag.Arg(0), &HelloFs{}, nil)
+	if err != nil {
+		log.Fatal("Mount fail: %v\n", err)
+	}
+	state.Loop(true)
+}