Add project 2 template files

02/FullAdder.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/2/FullAdder.hdl
+/**
+ * Computes the sum of three bits.
+ */
+CHIP FullAdder {
+    IN a, b, c;  // 1-bit inputs
+    OUT sum,     // Right bit of a + b + c
+        carry;   // Left bit of a + b + c
+
+    PARTS:
+    //// Replace this comment with your code.
+}