add nodeAccumulator
added SubscriptionTests for onTime and onChange
add  SubscriptionTest_ONTIMEINTERVAL.sh
fix typo in folder name
accumulator server refactor
accumulatorServer updated version
SubscriptionTest_ONCHANGE typo
SubscriptionTest_ONCHANGE default config text
SubscriptionTest_ONx indentation fix
SubscriptionTest_ONx APPEND instead of UPDATE
SubscriptionTest_ONx payload curl
SubscriptionTest_ONTime payload curl
SubscriptionTest_ONTime
SubscriptionTests CLI options ADDED
README.md ADDED
README.md format fixed
README.md format fixed2
README.md code style
Update README.md
readme.md typos