add actions for tests

.github/workflows/tests.yml

@@ -0,0 +1,31 @@
+name: test all
+
+on: [ push, pull_request ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: Test python API
+    defaults:
+      run:
+        working-directory: .
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-python@v2
+        with:
+          python-version: '3.10'
+      - name: Install requirements
+        run: |
+          pip install -r requirements.txt
+      - name: Run tests
+        run: |
+          python setup.py install
+          python example/example_hide_as_img.py
+          python example/example_hide_in_img.py
+          python example/example_img_exif.py
+          python example/example_hide_as_music.py
+          python example/example_hide_in_music.py
+          python example/example_img_seed.py
+          python example/example_hide_as_txt.py
+          python example/example_hide_in_txt.py
+          python example/example_mirage_tank.py