READMEP1

Compile:
	To compile the interpreter lisp.cpp, you can simply run the make fule using the command "make". If this for so
	me reason donesn't work, you can compile it using g++ using the c++11 standard:
	"g++ -std=c++0x lisp.cpp"
	Apparently, stdlinux doesn't support c++11 or higher...

Run:
	The makefile creates an executable called "lisp". You can run this using the command "./lisp".
	The interpreter expects inputs from std::cin. It will accept a series of lisp expressions separated by
	the '$' character, with the last lisp expression ending in "$$". Once you type in a lisp expression followied 
	by a $ on it's own line, the interpreter will evaluate that expression. If a line evaluates to $$, interpretation stops.
	Any spaces or standard lisp characters are accepted by the interpreter. New lines and tabs can be used to 
	separate lists. If a lisp expression is invalid, an error will be printed instead of it's standard notation.
	After the error is printed, the next s-expression is read and printed.

	When I run this, I use the command below:
	"cat tests.txt | ./lisp"
	Basically, I have a file named tests.txt which contains a series of lisp expressions of the form above. 
	I cat this, printing it to some output point, and pipe that to ./lisp, so the lisp program accepts the file
	as input. This is my suggested form of input, but you can also enter the tests manually, or copy-paste.