add VAGs and VAG Readme

VAG/README.md

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+# VAG files
+
+> VAG is the PlayStation single waveform data format for ADPCM-encoded data of sampled sounds, such as
+piano sounds, explosions, and music. The typical extension in DOS is “.VAG”.
+
+See [http://psx.arthus.net/sdk/Psy-Q/DOCS/FileFormat47.pdf](FileFormat47.pdf), p.209
+
+
+## WAV creation
+
+Use ffmpeg to create a 16-bit ADPCM mono WAV file - change -ar to reduce filesize (and quality)
+
+```bash
+$ ffmpeg -i input.mp3 -acodec pcm_s16le -ac 1 -ar 44100 output.wav
+```
+
+You can use Audacity to edit sound.
+
+## WAV to VAG convertion using WAV2VAG
+
+Get here : [https://github.com/ColdSauce/psxsdk/blob/master/tools/wav2vag.c](WAV2VAG)
+
+Change -freq according to the -ar setting above 
+
+```bash
+$ wav2vag input.wav output.vag -sraw16 -freq=44100 (-L) 
+```
+
+### Bug ? 
+
+After conversion with WAV2VAG, the resulting VAG will sometimes have a pop at the very beginning and/or end of the file.
+
+You can check (and delete) this with PsyQ's VAGEDIT.EXE.
+
+You can also force the sampling frequency of an existing VAG file.
+
+## VAG & SPU Docs
+
+See 
+  * libformat47.pdf p.209
+  * libover47.pdf,  p.271
+  * libref47.pdf,   p.980
+
+  * [http://psx.arthus.net/code/VAG/](http://psx.arthus.net/code/VAG)