doc: add summary

src/SUMMARY.md

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+# Summary
+
+- [Specification](specification/readme.md)
+
+  - [Tokens](specification/tokens/readme.md)
+
+    - [Token format](specification/tokens/token-format.md)
+    - [Operators](specification/tokens/operators.md)
+    - [Keywords](specification/tokens/keywords.md)
+    - [Identifiers](specification/tokens/identifiers.md)
+    - [Literals](specification/tokens/literals.md)
+    - [Brackets](specification/tokens/brackets.md)
+
+  - [Examples](examples/readme.md)

src/examples/readme.md

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+# Examples
+
+This is chapter about how the code in SymboScript looks.

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