init: basic structure

.github/FUNDING.yml

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+github: YunYouJun
+custom: https://sponsors.yunyoujun.cn

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches:
+      - main
+
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install pnpm
+        uses: pnpm/action-setup@v2
+
+      - name: Set node
+        uses: actions/setup-node@v2
+        with:
+          node-version: 16.x
+          cache: pnpm
+
+      - name: Install
+        run: pnpm install
+
+      - name: Lint
+        run: pnpm run lint
+
+  typecheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install pnpm
+        uses: pnpm/action-setup@v2
+
+      - name: Set node
+        uses: actions/setup-node@v2
+        with:
+          node-version: 16.x
+          cache: pnpm
+
+      - name: Install
+        run: pnpm install
+
+      - name: Typecheck
+        run: pnpm run typecheck