Add slither

.github/workflows/slither.yml

@@ -0,0 +1,22 @@
+name: Slither Analysis
+on: [push]
+jobs:
+  analyze:
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Run Slither
+        uses: crytic/[email protected]
+        id: slither
+        with:
+          sarif: results.sarif
+          fail-on: none
+          target: contracts/
+
+      - name: Upload SARIF file
+        uses: github/codeql-action/upload-sarif@v2
+        with:
+          sarif_file: ${{ steps.slither.outputs.sarif }}