add workflow to automatically add issues and prs to project

.github/workflows/add_to_project.yml

@@ -0,0 +1,19 @@
+name : add_to_project
+
+on :
+  pull_request:
+    types:
+      - opened
+  issues:
+    types:
+      - opened
+
+jobs:
+  add-to-project:
+    name: Add issue or pull request to project
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/add-to-project@v1
+        with:
+          project-url: https://github.com/orgs/pyfar/projects/3
+          github-token: ${{ secrets.ADD_TO_PROJECT_PAT }}

template/.github/workflows/add_to_project.yml

@@ -0,0 +1,19 @@
+name : add_to_project
+
+on :
+  pull_request:
+    types:
+      - opened
+  issues:
+    types:
+      - opened
+
+jobs:
+  add-to-project:
+    name: Add issue to project
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/add-to-project@v1
+        with:
+          project-url: https://github.com/orgs/pyfar/projects/3
+          github-token: ${{ secrets.ADD_TO_PROJECT_PAT }}

tests/test_copier.py

@@ -34,6 +34,7 @@ def test_project_folder(default_project):
     ".github/workflows/has_version_milestone.yml",
     ".gitignore",
     ".circleci/config.yml",
+    ".github/workflows/add_to_project.yml",
 ])
 def test_generated_file_exists(default_project, file_name):
     assert default_project.project_dir.joinpath(file_name).exists()