adding readme for nomsfs (#2280)

samples/go/nomsfs/.gitignore

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+nomsfs

samples/go/nomsfs/README.md

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+
+# Getting Started on Mac OS X
+
+1. Install [FUSE for OS X](https://osxfuse.github.io/)
+2. Load FUSE for OS X:
+```
+> sudo /Library/Filesystems/osxfusefs.fs/Support/load_osxfusefs
+```
+3. Create a local database:
+```
+> noms serve ldb:/tmp/nomsfs &
+```
+4. Build and run `nomsfs`:
+```
+> go run nomsfs.go http://localhost:8000::nomsfs directoryForMount
+```
+
+# Exploring `nomsfs`
+
+1. Once you have a mount point and `nomfs` is running you can add/delete/rename files and directories using Finder or the command line as you would with any other file system.
+2. Stop `nomfs` with `Ctrl+C`
+3. Let's look around the dataset:
+```
+> noms ds http://localhost:8000
+nomsfs
+> noms show http://localhost:8000::nomsfs
+struct Commit {
+  meta: struct {},
+  parents: Set<Ref<Cycle<0>>>,
+  value: struct Filesystem {
+    root: struct Inode {
+      attr: struct Attr {
+        ctime: Number,
+        gid: Number,
+        mode: Number,
+        mtime: Number,
+        uid: Number,
+        xattr: Map<String, Blob>,
+      },
+      contents: struct Directory {
+        entries: Map<String, Cycle<1>>,
+      } | struct Symlink {
+        targetPath: String,
+      } | struct File {
+        data: Ref<Blob>,
+      },
+    },
+  },
+}({
+  meta:  {},
+  parents: {
+    d6jn389ov693oa4b9vqhe3fmn2g49c2k,
+  },
+  value: Filesystem {
+    root: Inode {
+      attr: Attr {
+        ctime: 1.4703496225642643e+09,
+        gid: 20,
+        mode: 511,
+        mtime: 1.4703496225642643e+09,
+        uid: 501,
+        xattr: {},
+      },
+      contents: Directory {
+        entries: {
+          "file.txt": Inode {
+            attr: Attr {
+              ctime: 1.470349669044128e+09,
+              gid: 20,
+              mode: 420,
+              mtime: 1.465233596e+09,
+              uid: 501,
+              xattr: {
+                "com.apple.FinderInfo": 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  // 32 B
+                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00,
+              },
+            },
+            contents: File {
+              data: hv6f7d07uajec3mebergu810v12gem83,
+            },
+          },
+          "noms_logo.png": Inode {
+            attr: Attr {
+              ctime: 1.4703496464136713e+09,
+              gid: 20,
+              mode: 420,
+              mtime: 1.470171468e+09,
+              uid: 501,
+              xattr: {
+                "com.apple.FinderInfo": 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  // 32 B
+                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00,
+                "com.apple.quarantine": 30 30 30 32 3b 35 37 61 31 30 39 34 63 3b 50 72  // 22 B
+                65 76 69 65 77 3b,
+              },
+            },
+            contents: File {
+              data: higtjmhq7fo5m072vkmmldtmkn2vspkb,
+            },
+          },
+...
+```
+