Add Ci for smart contracts

.github/workflows/smart_contracts.yml

@@ -0,0 +1,38 @@
+name: Smart Contracts CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+
+jobs:
+  hardhat:
+    strategy:
+      fail-fast: true
+
+    name: Hardhat project
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./contracts
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: recursive
+
+      - name: Setup Node 16
+        uses: actions/setup-node@v3
+        with:
+          node-version: "16.x"
+          cache: "npm"
+
+      - name: Install Node dependencies
+        run: |
+          yarn install
+
+      - name: Run Hardhat tests
+        run: |
+          yarn test
+        id: hardhat-test