nomsfs blog: initial (bad) schema

nomsfs initial schema

struct Filesystem {
     inodes: Map<Number, struct Inode {
          attr: struct Attr { /* e.g. permissions, modification time, etc. */ }
          contents: Union {
               struct File { data: Ref<Blob> /* Noms pile of bytes */ } |
               struct Directory { contents: Map<String, Number> }
          }
     }>
     rootInode: Number
     maxInode: Number
}