Updated README

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 # deadbeef-shell
+===  
+The deadbeef shell is a fast, minimalist shell written in x86_64 
+Assembly for Linux. Currently it contains two builtins: cd and exit. It 
+can execute any program as a direct path (/path/to/program), from the PATH 
+variable (progam) or as a relative path (./program). Arguments are 
+separated by spaces.  
+To do (lowest to highest priority):  
+ - Implement environment variables, pass them to programs and provide 
+ export.
+ - Implement variables ($variablename).
+ - Implement providing a file as an argument instead of stdin so that the 
+ shell can be used as an interpreter.  
+ - Implement speech marks to separate arguments.