Removed setup.py and added a new package-testing workflow

.github/workflows/test-package.yml

@@ -0,0 +1,29 @@
+# This workflow will install the package, and try to run the package to check that the package install works fine
+
+name: Tests
+
+on:
+  push:
+    branches: [ '*' ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        python-version: [3.7, 3.8, 3.9, "3.10", "3.11"]
+
+    steps:
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install pygamma agreement
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install pygamma-agreement
+    - name: Test that CLI is running fine
+      run: |
+        pygamma-agreement -h