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* token: initial tokenizer.franck cuny2020-01-111-0/+48
This is the initial tokenizer for the monkey language. For now we recognize a limited number of tokens. We only have two keywords at this stage: `fn` and `let`. `fn` is used to create function, while `let` is used for assigning variables. The other tokens are mostly to parse the source code, and recognize things like brackets, parentheses, etc.