HPCC-9083 Document ECLWatch Tech Preview

Fix HPCC-9083 Document ECLWatch Tech Preview
Documenting changes to ECLWatch for Technical
Preview (for upcoming interface changes in 4.0)

Signed-off-by: g-pan <greg.panagiotatos@lexisnexis.com>
HPCC-9083 Document ECLWatch Tech Preview

Fix HPCC-9083 Document ECLWatch Tech Preview
Documenting changes to ECLWatch for Technical
Preview (for upcoming interface changes in 4.0)

Signed-off-by: g-pan <greg.panagiotatos@lexisnexis.com>