Add plugin cookiecutter

frontend/packages/plugins/_template/cookiecutter.json

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+{
+  "plugin_name": "Complexity"
+}

frontend/packages/plugins/_template/hooks/pre_gen_project.py

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+import re
+import sys
+
+
+def validate(name, regex, error_message):
+    if not re.match(regex, name):
+        print(error_message % name)
+
+        # exits with status 1 to indicate failure
+        sys.exit(1)
+
+
+validate('{{ cookiecutter.plugin_name }}',
+         r'^[a-z-]+$', 'ERROR: %s is not a valid plugin name! Only lowercase letters and hyphens are valid (Examples: my-amazing-plugin, myamazingplugin).')

frontend/packages/plugins/_template/{{ cookiecutter.plugin_name }}/README.md

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+{{cookiecutter.plugin_name}}

tools/cookiecutter/Dockerfile

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+FROM python:3.8-slim
+
+RUN pip install cookiecutter==1.7.0 --index-url https://pypi.python.org/simple
+
+ENTRYPOINT [ "cookiecutter" ]