Add complete assignment description and starter code.

Makefile

@@ -0,0 +1,13 @@
+all: parse
+
+parser.cpp parser.hpp: parser.y
+	bison -d -o parser.cpp parser.y
+
+scanner.cpp: scanner.l
+	flex -o scanner.cpp scanner.l
+
+parse: main.cpp parser.cpp scanner.cpp
+	g++ main.cpp parser.cpp scanner.cpp -o parse
+
+clean:
+	rm -f parse scanner.cpp parser.cpp parser.hpp