add github size action

.github/workflows/bundleSize.yaml

@@ -0,0 +1,14 @@
+name: Compressed Size
+
+on: [pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: preactjs/compressed-size-action@v2
+        with:
+          build-script: "build:odc"
+          pattern: "./dist/renderer/*.{js,css,html}"