Implemented the lexer.

...d08ac/s-gew6nes80m-1s21xde-5jv50nchg6bz/work-products.bin

...ntal/desolation_vm-pf5l7rcd08ac/s-gew6nes80m-1s21xde.lock

examples/lex.rs

examples/sq.t

src/ast/mod.rs

src/ast/node.rs

src/lex/consts.rs

src/lex/keyword.rs

src/lex/lexer.rs

src/lex/mod.rs

src/lex/token.rs

src/lexer/lex.rs

src/lexer/mod.rs

src/lib.rs