Add solutions for part 1

projects/01/Mux8Way16.hdl

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+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/01/Mux8Way16.hdl
+
+/**
+ * 8-way 16-bit multiplexor:
+ * out = a if sel == 000
+ *       b if sel == 001
+ *       c if sel == 010
+ *       d if sel == 011
+ *       e if sel == 100
+ *       f if sel == 101
+ *       g if sel == 110
+ *       h if sel == 111
+ */
+
+CHIP Mux8Way16 {
+    IN a[16], b[16], c[16], d[16],
+       e[16], f[16], g[16], h[16],
+       sel[3];
+    OUT out[16];
+
+    PARTS:
+
+    Mux4Way16(a=a, b=b, c=c, d=d, sel=sel[0..1], out=outabcd);
+    Mux4Way16(a=e, b=f, c=g, d=h, sel=sel[0..1], out=outefgh);
+    Mux16(a=outabcd, b=outefgh, sel=sel[2], out=out);
+}