Mention the new `time` crate in the doc index
//! * `serial_port`: simple driver for writing to the serial_port, used mostly for debugging.
//! * `spawn`: Functions and wrappers for spawning new Tasks.
//! * `task`: Task types and structure definitions, a Task is a thread of execution.
+//! * `time`: Abstractions to interact with hardware clocks.
//! * `tsc`: TSC (TimeStamp Counter) support for performance counters on x86. Basically a wrapper around rdtsc.
//! * `tss`: TSS (Task State Segment support (x86 only) for Theseus.
//! * `vfs_node`: contains the structs VFSDirectory and VFSFile, which are the most basic, generic implementers of the traits Directory and File
