Added release notes for v1.2.2.

Author: seidewitz

org.modeldriven.fuml/doc/release-notes/fuml-1.2.2.md

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+### fUML Reference Implementation
+### v1.2.2 Release Notes
+
+This is a production release of the fUML Reference Implementation tracking the issue resolutions approved in Ballot #3 of the fUML 1.3 Revision Task Force.
+
+### fUML Execution Engine
+
+The current base release for the fUML Execution Engine is v1.2.0b (see the [v1.2.0b Release Notes](./fuml-1.2.0b.md)), conforming to v1.2.1 of the [fUML Specification](http://www.omg.org/spec/FUML/1.2.1). The v1.2.2 tracking release includes implementation of resolutions to the following OMG issues, which have been approved by the fUML Revision Task Force for fUML 1.3 but have not yet been formally adopted, in addition to resolutions already implemented in [v1.2.1](./fuml-1.2.1.md). 
+
+The full list of open fUML issues is available at http://issues.omg.org/issues/task-force/FUML13.
+
+[FUML 13-17](http://issues.omg.org/issues/task-force/FUML13#issue-38717) Stand-alone owned behavior of BehavioredClassifier shall be possible
+
+[FUML 13-21](http://issues.omg.org/issues/task-force/FUML13#issue-39984) BasicInputOutput operations for reading and writing reals are missing
+
+[FUML 13-23](http://issues.omg.org/issues/task-force/FUML13#issue-40625) EventOccurrence should be used instead of SignalInstance in execution model operation parameters
+
+[FUML 13-25](http://issues.omg.org/issues/task-force/FUML13#issue-40627) Refactor EventOccurrence to provide useful operations
+
+[FUML 13-26](http://issues.omg.org/issues/task-force/FUML13#issue-40628) Reference::equal should use Object::equals
+
+### XMI Loader/Infrastructure
+
+This tracking release includes all resolutions from [v1.2.0b](./fuml-1.2.0b.md) and previous maintenance releases.
+
+#### Bug Fixes
+
+None
+
+#### Improvements
+
+None