Add local TODO for steady-state work

Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/TODO b/TODO
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+Known issues/TODO (for steady-state)
+
+- Does not work over a network connection
+
+- Add output for --output-format=normal
+
+- Add example job files
+
+- group_reporting must be set for every job in a group
+
+- Undefined behavior when steady state options differ across jobs in a
+  single group
+
+- Allow user to specify the frequency of measurements
+
+- Better documentation for output
+
+- Report read, write, trim IOPS/BW separately
+
+- Semantics for the ring buffer ss->head are confusing. ss->head points
+  to the beginning of the buffer up through the point where the buffer
+  is filled for the first time. afterwards, when a new element is added,
+  ss->head is advanced to point to the second element in the buffer. if
+  steady state is attained upon adding a new element, ss->head is not
+  advanced so it actually does point to the head of the buffer.