first add ci

Author: pixclk

.github/workflows/benchmark.yml

@@ -0,0 +1,21 @@
+name: benchmark
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: make
+      run:  make
+    - name: benchmark
+      run:  ./examples/benchmark
+    - name: make clean
+      run:  make clean