added WHATSNEW.md

Author: avarga

WHATSNEW.md

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+OpenFlow-20250605
+-----------------
+
+* Ported to INET-4.x. See `inet4-migration-notes/` for details.
+* Renamed `AbstractControllerApp` NED type to `IControllerApp`
+* Added NED documentation for several undocumented modules
+* Tested with omnetpp-6.1 and inet-4.5.4. Builds and runs with
+  the 4.4.2 branch too.
+
+
+OpenFlow-20250602
+-----------------
+
+Patch release for OpenFlow 20240124.
+
+* Added `setenv` script
+* Updated `fingerprinttest` script, added network-level (~tNl) fingerprints
+* ARPResponder: fix: do not add preamble and SFD to frame length
+* StaticSpanningTree: fixed wrong numInitStages
+* Fill in OFB_IN_PORT in internal messages
+* More assertions in the code
+* Compatible with omnetpp-6.1 and inet-3.8.5
+
+
+OpenFlow-20240124
+-----------------
+
+* Identical to https://github.com/CoRE-RG/OpenFlow/releases/tag/nightly%2F2024-01-24_15-05-30
+* Compatible with omnetpp-6.0.3 and inet-3.8.3