Lexer & Initial REPL

[dineshUmasankar]

Description

Initial implementation of the REPL to simply respond back with tokens from input scanned.
Initial Implementation of the base level of tokens defined from Thorsten Ball's Monkey Language Book.

Closes #8

Testing Guidelines

• Manually pull branch, and run go test ./lexer
• Ensure all tests pass and all tokens are being covered within tests from token definition

[dineshUmasankar]

@BabyKangaroo117

I ran the instructions within testing guidelines and ran into the following error:

# YARTBML/lexer
lexer/lexer_test.go:108:11: missing ',' in composite literal
FAIL    YARTBML/lexer [setup failed]
FAIL