init ci

.github/workflows/test.yml

@@ -0,0 +1,20 @@
+name: leetcode test
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out repo
+      uses: actions/checkout@v2
+    - name: setup
+      run: |
+        sudo apt-get update
+        sudo apt-get install cmake g++ make
+    - name: test
+      run: |
+        mkdir build && cd build && cmake .. && make
+        ./test