Add solutions for part 1

tools/builtInChips/Or.hdl

@@ -0,0 +1,16 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: tools/builtIn/Or.hdl
+
+
+/**
+ * Or gate: out = 1 if {a == 1 or b == 1}, 0 otherwise  
+ */
+
+CHIP Or {
+
+    IN  a, b;
+    OUT out;
+
+    BUILTIN Or;