perform CI via github actions

.github/workflows/build.yml

@@ -0,0 +1,26 @@
+name: Rust
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build-macos:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install dependencies
+        run: brew install portaudio pkg-config
+      - name: Build
+        run: cargo build --verbose --no-default-features --features portaudio_backend,cursive/pancurses-backend
+
+  build-linux:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install dependencies
+        run: sudo apt install libpulse-dev libdbus-1-dev libncursesw5-dev  libxcb-shape0-dev libxcb-xfixes0-dev
+      - name: Build
+        run: cargo build --verbose