add sync upstream

.github/workflows/sync-fork.yml

@@ -0,0 +1,19 @@
+name: Sync Fork
+
+on:
+  schedule:
+    - cron: '0 0 * * *' # every day at 00:00.
+  workflow_dispatch: # on button click
+
+jobs:
+  sync:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: tgymnich/[email protected]
+        with:
+          owner: TownSquareXYZ
+          base: localization 
+          head: main
+          pr_title: 'Fork Sync: Update from tact-lang/tact-docs'