Add action on duplilcation code test

Author: jinningwang

.github/workflows/dupcode.yml

@@ -0,0 +1,14 @@
+name: Duplicate code
+
+on: [push, pull_request]
+
+jobs:
+  duplicate-code-check:
+    name: Check for duplicate code
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Check for duplicate code
+        uses: platisd/duplicate-code-detection-tool@master
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          directories: "ams/"