added sableCC calculator

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+# simpleSableCCCalculator
+
+sableCC is a too used to parse .grammar files (containing a BNF, and lexer information)
+into a lexer and parser. We can do a depth first traversal of the produced abstract syntax tree
+to parse in the correct order. This is in the file `Translation.java`.
+
+You produce a lexer and parser by running the sablecc .jar file you can download [here](http://downloads.sourceforge.net/sablecc/sablecc-3.7.zip). Then run it with the first argument as the grammar file:
+
+`java -jar sablecc-3.7/lib/sablecc.jar sableCCCalculator.grammar`
+
+(changing the paths as appropriate). The produced java files are not included in git since they're unnessicary. We compile the compiler, program stack and translator:
+
+`javac sableCCCalculator/*.java`
+
+Then we can run the program. For now it only works by reading files. There are some example maths questions in the examples folder:
+
+`java sableCCCalculator.Compiler examples/maths.txt`
+
+
+