Bloxberg proof of concept

Summary

This MR allow users to certify a single entity with the Bloxberg blockchain.

Tests are still missing.

Focus

• Does the API look usable for other programmers?

Test Environment

• Start your own CaosDB server and make sure that your pycaosdb.ini will connect to it.
• Install this project with pip3 install .
• Start Python shell and run:

import caosadvancedtools.bloxberg.bloxberg as blx
blx.demo_run()

• Check in your CaosDB instance that the RecordTypes and Records look OK: https://localhost:10443/Entity/?query=FIND%20Bloxb*
• Verify the certificate (stored at /tmp/cert.json or saved from the certificate Record) at https://certify.bloxberg.org/verify

Check List for the Author

• All automated tests pass
• Reference related Issue: #34 (closed)
• Up-to-date CHANGELOG.md
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there spezifications? Are they satisfied?

For further good practices have a look at our review guidelines.

src/caosadvancedtools/models/__init__.py

+"""Submodule for working with data models.
+"""

[Daniel Hornung]

This and the following changes are mostly only documentation or formatting.