Enable compressed-size-action for PRs (#283)

https://github.com/marketplace/actions/compressed-size-action

Author: simon04

.github/workflows/compressed-size.yml

@@ -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@v1
+        with:
+          repo-token: '${{ secrets.GITHUB_TOKEN }}'
+          pattern: 'dist/Control.Geocoder.{css,js}'