doc: add summary

.github/workflows/gh-pages.yml

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+name: github pages
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-20.04
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.ref }}
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup mdBook
+        uses: peaceiris/actions-mdbook@v1
+        with:
+          mdbook-version: "latest"
+
+      - run: mdbook build
+
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v3
+        if: ${{ github.ref == 'refs/heads/main' }}
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./book

.gitignore

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+book

book.toml

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+[book]
+authors = ["artegoser"]
+language = "en"
+multilingual = false
+src = "src"
+title = "SymboScript book"

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