add a TRACKER idea to the project

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+# Minimal Audio Tracker
+
+in addition to being able to generate spectrograms (aka "Samples") on the
+fly and play them at once, we need a way to assemble samples (assets or 
+generated) into modifiable patterns and loops. Like what the Trackers were
+doing in the old time.
+
+## The idea
+
+A script can take a 'tracker music' text file that describes the sequence
+of samples (a 'pattern') in a first part. In a second part, these sequence
+a laid out with a timestamp (potentially overlapping) to generate the full
+music score.
+
+The patterns' samples (spectrograms) are not yet generated, it's just the
+'musical score' here. We still need to 'play' the score but with modifiers
+applied.
+
+### Modifiers
+
+For diversity, these essential patterns can be modified on the fly before
+being generated as spectrogram on the fly.
+Modifiers could be:
+  * randomize (for drums, e.g.)
+  * add accents and stresses
+  * modulate volume
+  * add distortion or noise
+  * add 'grain' and static noise
+  * flanger, vocoding, robotic voice, etc.
+  * etc.
+
+These modifiers are applied to a predefined pattern just before it's
+generated for playback (or assembling in the final track).
+
+### How would that work in practice?
+
+The musical score is a text file, that a tool will convert to run-time
+code to be compiled in the final binary demo64k.
+This generated code can be mixed with fixed code from the demo codebase
+itself (explosion predefined at a given time ,etc.)
+The baking is done at compile time, and the code will go in src/generated/
+
+