Add a build job to the CI

.github/workflows/build.yml

@@ -0,0 +1,20 @@
+name: Build
+
+on: [push]
+
+jobs:
+  build_windows:
+    runs-on: windows-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Install stable toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          profile: minimal
+          override: true
+
+      - name: Build
+        run: cargo build --release