added ci

.github/workflows/echo-rs-ci.yml

@@ -0,0 +1,27 @@
+name: echo-rs CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Set up echo-rs
+        uses: actions/checkout@v2
+      - name: Install cargo-audit
+        run: cargo install cargo-audit
+      - name: Build
+        run: cargo build --verbose
+      - name: test
+        run: python3 gnu_echo_tests/test.py -e /bin/echo -b target/debug/echo-rs
+      - name: Clippy
+        run: cargo clippy --verbose -- -D warnings
+      - name: Audit
+        run: cargo audit