Add mandelbrot example

examples/mandelbrot.psl

@@ -0,0 +1,30 @@
+foreign func putchar(c: i32) -> i32
+
+func print(c: u8):
+	putchar(c as i32)
+
+func mandelbrot():
+	let width = 120
+	let height = 40
+	mut y = 0
+	while y < height:
+		mut x = 0
+		while x < width:
+			let cx = (x as f32 + 0.5) / (width as f32) * 2.5 - 2.0
+			let cy = (y as f32 + 0.5) / (height as f32) * 2.0 - 1.0
+			mut tx = 0.0
+			mut ty = 0.0
+			mut i = 0
+			while i < 100 && (tx * tx + ty * ty < 4.0):
+				let newx = tx * tx - ty * ty + cx
+				ty = 2.0 * tx * ty + cy
+				tx = newx
+				i = i + 1
+			if i == 100:
+				print('X')
+			else:
+				print(' ')
+			
+			x = x + 1
+		y = y + 1
+		print('\n')