Add dockerignore and an env.example

.dockerignore

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+.git/
+.pytest_cache/
+__pycache__/
+.env*

.env.example

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+RS_FIREBASE_CREDENTIALS_PATH = 'firebase-credentials.json'
+RS_WORDLE_USER = 'myuser@rootstrap.com'
+RS_WORDLE_URL = 'http://localhost:3000'
+RS_WORDLE_MODEL_NAME = 'the_best_ai_model_saved.pth'
+RS_WORDLE_PASSWORD = 'myemailpassword'
+FLASK_DEBUG = 'true'
+SECRET_KEY = 'asecretkey4flask'