Add python-helloworld app

Lesson-3-Containerization/python-helloworld/Dockerfile

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+FROM python:3.8
+LABEL maintainer="Udacity"
+
+COPY . /app
+WORKDIR /app
+RUN pip install -r requirements.txt
+
+# command to run on container start
+CMD [ "python", "app.py" ]

Lesson-3-Containerization/python-helloworld/app.py

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+from flask import Flask
+from flask import json
+import logging
+
+app = Flask(__name__)
+
+@app.route('/status')
+def healthcheck():
+    response = app.response_class(
+            response=json.dumps({"result":"OK - healthy"}),
+            status=200,
+            mimetype='application/json'
+    )
+
+    app.logger.info('Status request successfull')
+    return response
+
+@app.route('/metrics')
+def metrics():
+    response = app.response_class(
+            response=json.dumps({"status":"success","code":0,"data":{"UserCount":140,"UserCountActive":23}}),
+            status=200,
+            mimetype='application/json'
+    )
+
+    app.logger.info('Metrics request successfull')
+    return response
+
+@app.route("/")
+def hello():
+    app.logger.info('Main request successfull')
+
+    return "Hello World!"
+
+if __name__ == "__main__":
+    ## stream logs to a file
+    logging.basicConfig(filename='app.log',level=logging.DEBUG)
+
+    app.run(host='0.0.0.0')

Lesson-3-Containerization/python-helloworld/requirements.txt

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+Flask==1.1.1
+werkzeug==0.16.1

Lesson-3-Containerization/python-helloworld/test_with_pytest.py

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+## Define a test that will always pass successfully
+def test_always_passes():
+    assert True