diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
new file mode 100644
index 0000000..f0548e8
--- /dev/null
+++ b/.github/workflows/pull-request.yml
@@ -0,0 +1,15 @@
+name: pull_request
+
+on:
+  pull_request:
+    branches:
+      - main
+jobs:
+
+  unit-testing-and-build:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+    - uses: actions/checkout@v
+    - uses: actions/setup-python@v4
+    - uses: pre-commit/action@v3.0.0
diff --git a/examples/__pycache__/use_cases.cpython-38.pyc b/examples/__pycache__/use_cases.cpython-38.pyc
deleted file mode 100644
index a74682a..0000000
Binary files a/examples/__pycache__/use_cases.cpython-38.pyc and /dev/null differ