Create sync_hf_hub.yaml for syncing repo to HF

Following instructions from https://docs.github.com/en/repositories/working-with-files/managing-files/creating-new-files and https://huggingface.co/docs/hub/spaces-github-actions

.github/workflows/sync_hf_hub.yaml

@@ -0,0 +1,20 @@
+name: Sync to Hugging Face hub
+on:
+  push:
+    branches: [main]
+
+  # to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  sync-to-hub:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+          lfs: true
+      - name: Push to hub
+        env:
+          HF_TOKEN: ${{ secrets.HF_TOKEN }}
+        run: git push https://yenniejun:$HF_TOKEN@huggingface.co/spaces/yenniejun/tokenizers-languages main