Added first example.

examples/true/Tupfile

@@ -0,0 +1,16 @@
+LEXER    = flex
+PARSER   = bison
+CXX      = g++
+CXXFLAGS = -pedantic -std=c++17 -Wall -Wno-unused-parameter -Wno-reorder -Wno-sign-compare -Wno-address -Wno-noexcept-type -Wno-unknown-attributes -Wno-unknown-warning-option
+CPPFLAGS =
+LDFLAGS  =
+LIBS     =
+
+SRC_DIR   = .
+BUILD_DIR = build
+PROG      = true
+
+: foreach $(SRC_DIR)/*.yy                    |> $(PARSER) -b %BArgGrammarParser %f                       |> $(SRC_DIR)/%BArgGrammarParser.tab.cc $(SRC_DIR)/%BArgGrammarParser.tab.hh
+: foreach $(SRC_DIR)/*.ll | $(SRC_DIR)/*.hh  |> $(LEXER) %f                                              |> $(SRC_DIR)/%BArgGrammarScannerDef.cpp
+: foreach $(SRC_DIR)/*.cpp $(SRC_DIR)/*.cc | $(SRC_DIR)/*.hh |> $(CXX) $(CPPFLAGS) $(CXXFLAGS) -I $(SRC_DIR) -c %f -o %o |> $(BUILD_DIR)/%B.o
+: $(BUILD_DIR)/*.o                           |> $(CXX) $(LDFLAGS) $(LIBS) %f -o %o                       |> $(PROG)