add maude files

README.md

maude/alt-smt.maude

maude/analysis.maude

maude/examples/checking-train-solutions.maude

maude/examples/coffee-folding.maude

maude/examples/coffee-strategy.maude

maude/examples/coffee.maude

maude/examples/ex-fig3a.maude

maude/examples/ex-fig3b-folding.maude

maude/examples/ex-fig3b.maude

maude/examples/figure-4a.maude

maude/examples/figure-4b.maude

maude/examples/fischer.maude

maude/examples/train-intruder.maude

maude/fme.maude

maude/meta-pta.maude

maude/pta-base.maude

maude/semantics.maude

maude/state.maude

maude/syntax.maude