Create README.md

Author: HammerMaximilian

README.md

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+# fUML Reference Implementation for *C++*
+This software is an open source reference implementation of the *Semantics of a Foundational Subset for Executable UML Models* (fUML)
+specification by the *Object Management Group* (OMG) (see [here](https://www.omg.org/spec/FUML/1.5/About-FUML)). This implementation is based on the Java fUML reference implementation developed by
+*Model Driven Solutions* (see [https://github.com/ModelDriven/fUML-Reference-Implementation](https://github.com/ModelDriven/fUML-Reference-Implementation))
+
+## Licensing
+For licensing information, please see the [LICENSE.md](https://github.com/HammerMaximilian/fUML-CPP/blob/master/LICENSE) file.
+
+## Building
+TBD
+
+## Usage
+TBD