Add CI workflow + funding file.

.github/FUNDING.yml

@@ -0,0 +1,3 @@
+github: ShieldBattery
+ko_fi: tec27
+patreon: tec27

.github/workflows/ci.yml

@@ -0,0 +1,79 @@
+name: CI
+
+on: [push, pull_request]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  clippy:
+    runs-on: windows-latest
+    defaults:
+      run:
+        working-directory: ./native
+    strategy:
+      fail-fast: false
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+
+      - uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: ./native
+
+      - name: clippy
+        run: cargo clippy --all-targets --workspace -- -D warnings
+
+  fmt:
+    runs-on: windows-latest
+    defaults:
+      run:
+        working-directory: ./native
+    strategy:
+      fail-fast: false
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+
+      - name: rustfmt
+        run: cargo fmt --all -- --check
+
+  test:
+    runs-on: windows-latest
+    strategy:
+      fail-fast: false
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: ./native
+
+      - name: Using pnpm v8.x
+        uses: pnpm/action-setup@v2
+        with:
+          version: 8
+
+      - name: Using Node.js 20.x
+        uses: actions/setup-node@v3
+        with:
+          node-version: '20.x'
+          cache: 'pnpm'
+
+      - name: Install JS dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Tests
+        run: pnpm test