update readme

README.md

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-# WORK IN PROGRESS
+# ZX MIDI player
 MIDI Player for ZX Spectrum.
 [![screenshot](screenshot.png)](screenshot.png?raw=true)
-* Support for any ZX Spectrum-compatible computer with 128 RAM, e.g.:
+
+Quick demo video: https://www.youtube.com/watch?v=X_hX_dGmGeg
+
+* Support for any ZX Spectrum-compatible computer with 128Kb RAM, e.g.:
     - ZX Spectrum 128/+2/+3 with [MAYK](https://github.com/konkotgit/MAYK) addon;
     - [Sizif-512](https://github.com/UzixLS/zx-sizif-512) with [extension board](https://github.com/UzixLS/zx-sizif-512-ext);
     - [ZX-Uno.1010](https://github.com/UzixLS/zxuno1010-board) or [ZX-Uno](https://zxuno.speccy.org/index_e.shtml) with MIDI addon;
     - [ZX Evolution](http://nedopc.com/zxevo/zxevo.php) with [Multisound](https://github.com/UzixLS/zx-multisound) addon.
-* Support for MIDI type 0, type 1 and RMI file formats;
+* Support for MID(SMF) type 0, type 1 and RMI file formats;
 * Support files up to 64Kb;
 * Support for up to 60 tracks in file (for heavier files, turbo CPU frequency is desirable);
 * Support for various CPU frequencies - 3.5MHz, 3.54MHz, 7MHz, 14MHz, 28MHz (no-waitstates required for turbo modes);
 * Support for BetaDisk/TR-DOS floppy interface (compatible with [ESXDOS](http://www.esxdos.org/index.html));
-* External MIDI synthesizer required.
+* Hardware MIDI synthesizer required.
 
 ## MIDI synthesizer wiring
 MIDI synthesizer data input should be connected to AY port A2.