Add initial crate

.github/workflows/publish.yml

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+name: Publish (NPM)
+
+on:
+  release:
+    types: [published]
+
+jobs:
+
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Install Node
+      uses: actions/setup-node@v3
+      with:
+        node-version: '18.x'
+        registry-url: 'https://registry.npmjs.org'
+        always-auth: true
+    - uses: stellar/binaries@v23
+      with:
+        name: wasm-pack
+        version: 0.12.1
+    - uses: stellar/binaries@v23
+      with:
+        name: wasm-bindgen-cli
+        version: 0.2.92
+    - run: make build
+    - run: wasm-pack publish --target web
+      env:
+        NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}

.github/workflows/rust.yml

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+name: Rust
+
+on:
+  push:
+    branches: [main, release/**]
+  pull_request:
+  merge_group:
+
+defaults:
+  run:
+    shell: bash
+
+env:
+  RUSTFLAGS: -Dwarnings
+
+jobs:
+
+  complete:
+    if: always()
+    needs: [fmt, check-git-rev-deps, build-and-test]
+    runs-on: ubuntu-latest
+    steps:
+    - if: contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled')
+      run: exit 1
+
+  fmt:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - run: rustup update
+    - run: cargo fmt --all --check
+
+  cargo-deny:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        checks:
+          - advisories
+          - bans licenses sources
+    # Prevent sudden announcement of a new advisory from failing ci:
+    continue-on-error: ${{ matrix.checks == 'advisories' }}
+    steps:
+    - uses: actions/checkout@v3
+    - uses: EmbarkStudios/cargo-deny-action@b01e7a8cfb1f496c52d77361e84c1840d8246393
+      with:
+        command: check ${{ matrix.checks }}
+
+  check-git-rev-deps:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: stellar/actions/rust-check-git-rev-deps@main
+
+  build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: stellar/actions/rust-cache@main
+    - uses: stellar/binaries@v23
+      with:
+        name: wasm-pack
+        version: 0.12.1
+    - uses: stellar/binaries@v23
+      with:
+        name: wasm-bindgen-cli
+        version: 0.2.92
+    - run: echo RUSTFLAGS='-Dwarnings' >> $GITHUB_ENV
+    - run: rustup update
+    - run: cargo version
+    - run: rustup target add wasm32-unknown-unknown
+    - run: make build
+    - uses: actions/upload-artifact@v4
+      with:
+        name: web
+        path: pkg/web
+    - uses: actions/upload-artifact@v4
+      with:
+        name: deno
+        path: pkg/deno
+    - run: make test
+    - run: git add -N . && git diff HEAD --exit-code

.gitignore

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+/target/
+/pkg/

CONTRIBUTING.md

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+# Contributing
+
+## Development
+
+### Build
+
+```
+make build
+```
+
+### Test
+
+```
+make test
+```