Add codebases for Python samples

[jhuleatt]

• Move all main.py and requirements.txt into a functions folder to match the getting started guide
• Add a firebase.json that declares a codebase for each python sample
• Add a README for each sample (though it doesn't really say anything yet)

This was done by running the following shell script twice, once in the Python folder, and once in the Python/quickstarts folder:

for f in */main.py; do
    SAMPLE_FOLDER="${f%/main.py}"
    echo "${SAMPLE_FOLDER}"

    mkdir "${SAMPLE_FOLDER}/functions"
    mv "${SAMPLE_FOLDER}/main.py" "${SAMPLE_FOLDER}/functions/main.py"
    mv "${SAMPLE_FOLDER}/requirements.txt" "${SAMPLE_FOLDER}/functions/requirements.txt"
    touch "${SAMPLE_FOLDER}/README.md"
    echo "# ${SAMPLE_FOLDER}" > "${SAMPLE_FOLDER}/README.md"
    echo "{\n  \"functions\": {\n    \"codebase\": \"${SAMPLE_FOLDER}\"\n  }\n}" > "${SAMPLE_FOLDER}/firebase.json"
done

Probably easiest to review by browsing the Python directory for the branch.

NOTE: We'll have to update the snippets repo since the paths to samples changed

[egilmorez]

LG, thanks Jeff!