Python Conversation http Quickstart

[rochabr]

Description

Creating Conversation Quickstart for Python - HTTP

Issue reference

Please reference the issue this PR will close: #1108

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• The quickstart code compiles correctly
• You've tested new builds of the quickstart if you changed quickstart code
• You've updated the quickstart's README if necessary
• If you have changed the steps for a quickstart be sure that you have updated the automated validation accordingly. All of our quickstarts have annotations that allow them to be executed automatically as code. For more information see mechanical-markdown. For user guide with examples see Examples.

[rochabr]

@alicejgibbons

[elena-kolevska]

LGTM, but let's wait for the crypto test fix to get merged first, so we can see this test passing.

[marcduiker]

Suggested two small changes to ensure all multi-app run files always start with the appID key in the apps array. Related to PR #1152.

[alicejgibbons]

LGTM, ready to merge after Elena's PR: #1148