doc: add summary

src/specification/readme.md

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+# Specification

src/specification/tokens/brackets.md

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+# Brackets

src/specification/tokens/identifiers.md

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+# Identifiers

src/specification/tokens/keywords.md

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+# Keywords

src/specification/tokens/literals.md

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+# Literals

src/specification/tokens/operators.md

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+# Operators

src/specification/tokens/readme.md

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+# Tokens
+
+This chapter describes the tokens specification. All of the tokens in the design are described in this section.

src/specification/tokens/token-format.md

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+# Token format