defined new github action for running tests

.github/workflows/testing.yml

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+name: Testing
+
+# Controls when the action will run. 
+on:
+  # Triggers the workflow on push or pull request events but only for the main branch
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "testing"
+  testing:
+    name: Testing (${{ matrix.python-version }}, ${{ matrix.os }})
+    # The type of runner that the job will run on (each of the os matrix below)
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ["ubuntu-latest", "macos-latest", "windows-latest"]
+        python-version: ["3.x", "3.8"]
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      - uses: conda-incubator/setup-miniconda@v2
+        with:
+          auto-update-conda: true
+          python-version: ${{ matrix.python-version }}
+      - name: Conda info
+        shell: bash -l {0}
+        run: conda info
+      - name: Conda list
+        shell: pwsh
+        run: conda list
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
+      - name: Dummy
+        shell: bash -l {0}
+        run: ls -la