Some initial work

Some basic Inode stuff
Some basic Archive stuff

src/util/offset_file.zig

@@ -0,0 +1,13 @@
+const std = @import("std");
+const FileReader = std.fs.File.Reader;
+
+const OffsetFile = @This();
+
+fil: std.fs.File,
+offset: u64 = 0,
+
+pub fn readerAt(self: OffsetFile, offset: u64, buf: []u8) !FileReader {
+    var rdr = self.fil.reader(buf);
+    try rdr.seekTo(self.offset + offset);
+    return rdr;
+}