Updated description

README.md

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 ## Z80 Tools
 
 Development environment for Z80-based computers.
+
+**Features:**
+
+ * Editor with source code highlight and auto-formatting features
+ * Advanced assembler, generates binary, Intel Hex and listing outputs
+ * Integrated debugger with simple SIO emulation
+ * ANSI / VT-100 terminal with support for packed and XModem binary uploads
+ * Multiplatform (Linux, Windows and MacOS)