Added audit workflow to check for security vulnerabilities

.github/workflows/audit.yml

@@ -0,0 +1,20 @@
+name: audit
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 0 * * 1"
+
+jobs:
+  audit:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions-rs/install@master
+        with:
+          crate: cargo-audit
+
+      - uses: actions-rs/audit-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}