Add solutions for part 1

projects/02/Inc16.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/02/Inc16.hdl
+
+/**
+ * 16-bit incrementer:
+ * out = in + 1 (arithmetic addition)
+ */
+
+CHIP Inc16 {
+    IN in[16];
+    OUT out[16];
+
+    PARTS:
+    Add16(a=in, b[0]=true, b[1..15]=false, out=out);
+}