Add API Reference

API-Reference.md

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+The following functions are provided by the library:
+
+## Drawing Functions
+
+|Function|Description|
+|---|---|
+|s.cls(color=0)|Clear screen|
+|s.rectfill(x, y, w, h, color=0)|Filled rectangle|
+|s.circfill(x, y, r, color=0)|Filled circle|
+|s.line(x1, y1, x2, y2, color=0)|Line segment|
+|s.text(x, y, message, color=3, size="normal")|Text rendering|
+
+## Transformations and styles
+
+|Function|Description|
+|---|---|
+|s.push() / s.pop()|State stack|
+|s.translate(x, y)|Move origin|
+|s.rotate(radians)|Rotate origin|
+|s.alpha(value)|Change global transparency (0.0-1.0)|
+
+## Input and utilities
+
+|Function|Description|
+| --- | --- |
+|s.iskeydown(key)|Keyboard state|
+|s.rand(min=0, max=1)|Random float|
+|s.randi(min=0, max=1)|Random integer|
+
+