docs: simplify readme

Author: TomerAberbach

README.md

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+# Mano Simulator
+
+> An assembler and hardware simulator for the Mano Basic Computer, a 16 bit computer.
+
+This is a JavaFX application that compiles assembly code for and runs a simulation of Mano's Computer as detailed in:
+
+Computer System Architecture, 3rd edition
+by M. Morris Mano
+Published by Prentice-Hall, c 1993
+Chapter 5, pp 123-172.
+
+## Usage
+
+Make sure you have Java and JavaFX installed. Some Java installations bundle JavaFX, but some do not.
+
+Download the latest jar from [releases](https://github.com/TomerAberbach/mano-simulator/releases) and then run the following command:
+
+```sh
+$ java -jar mano-simulator.jar
+```
+
+## License
+
+[MIT](https://github.com/TomerAberbach/mano-simulator/blob/master/license) © [Tomer Aberbach](https://github.com/TomerAberbach)