preeliminary c140 doc

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+# Namco C140
+
+Namco C140 is a 24-channel custom PCM sound chip manufactured jointly by Fujitsu and Namco. It was first used in Namco Sytem 2 arcade family starting in 1987.
+
+This chip features:
+
+- stereo soft panning
+- accepts either raw 12-bit PCM or proprietary 8-bit u-law compressed PCM samples
+- 21.4 kHz sampling rate
+
+# effects
+
+- `80xx`: set panning (`00: left, `80`: center, `FF`: right)
+- `81xx`: set left channel panning 
+- `82xx`: set right channel panning 
+
+# info
+
+this chip uses the [C140](../4-instrument/c140.md) instrument editor.