Adding GH actions to update SDK (#30)

* Adding sdk npm services

.github/workflows/sync-to-sdk-repo.yml

@@ -0,0 +1,28 @@
+name: Sync to SDK Repository
+
+on:
+  push:
+    paths:
+    - 'typed_contracts/**'
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout source repo
+      uses: actions/checkout@v2
+
+    - name: Push to destination repo
+      run: |
+        git config --global user.name "GitHub Action"
+        git config --global user.email "action@github.com"
+        
+        git clone https://${{ secrets.XSIGNER_ACCESS_TOKEN }}@github.com/protofire/xsigners-sdk.git xsigners_sdk 
+        cp -r typed_contracts xsigners_sdk/src/
+        
+        cd xsigners_sdk 
+        git remote set-url origin https://${{ secrets.XSIGNER_ACCESS_TOKEN }}@github.com/protofire/xsigners-sdk.git
+        git add .
+        git commit -m "Sync from contracts source repo"
+        git push
+