installed express and added github (CI) actions

.github/workflows/build.yml

@@ -0,0 +1,37 @@
+name: Build CI
+
+on:
+  push:
+    branches-ignore:
+      - master
+      - develop
+jobs:
+  build_on_linux:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+      - uses: actions/setup-node@master
+        with:
+          node-version: 12
+      - run: npm install
+      - run: npm run build
+
+  build_on_mac:
+    runs-on: macOS-latest
+    steps:
+      - uses: actions/checkout@master
+      - uses: actions/setup-node@master
+        with:
+          node-version: 12
+      - run: npm install
+      - run: npm run build
+
+  build_on_win:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@master
+      - uses: actions/setup-node@master
+        with:
+          node-version: 12
+      - run: npm install
+      - run: npm run build