Add mulberry32

lib/mulberry32.ts

@@ -0,0 +1,12 @@
+/**
+ * @see https://github.com/cprosche/mulberry32
+ */
+export function mulberry32(a: number) {
+	return () => {
+		a |= 0;
+		a = (a + 0x6d2b79f5) | 0;
+		let t = Math.imul(a ^ (a >>> 15), 1 | a);
+		t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
+		return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
+	};
+}