Updated the examples.md and organized all federated learning algorithms.

[NingxinSu]

Updated the examples.md and organized all federated learning algorithms.

Description

Added and updated the description and reference of all algorithms;
Organized algorithms into sub-folders under examples/ by different categories.

How has this been tested?

By the running commands in examplers.md

Types of changes

• Bug fix (non-breaking change which fixes an issue) Fixes #
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code has been formatted using Black and checked using PyLint.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

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