[ISSUE-120] 🔀 Merge adding changelog into main

[MokhFn]

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Description

• Add a CHANGELOG file.
• Add CI/Actions to automatically manage timestamps/tags
• Fix Add changelog/release history #120

[dimkarakostas]

LGTM in general. Remove the toc command and will merge afterwards.

[dimkarakostas]

Github automatically generates a table of contents so no need for [[_TOC_]] here. LGTM other than that

[LadyChristina]

Is this still work in progress?

[MokhFn]

@LadyChristina : Sorry, i have been busy, i'll re work on this ASAP and let you know.
Initially, i wanted to simply add a changelog. Then i thought it would be better to include tox, auto updates for docs and running tests withing a tox env, and update the CI structure a bit.
I can divide into two larger tasks/PRs, and this PRs becomes only a hangelog update/init.
Thoughts ?

[LadyChristina]

Sounds good! Let's keep this PR just for the changelog and feel free to create a new branch for the other task

[MokhFn]

Suggestion has been applied, but with all the history for the last year, what's the best way to go ?
Transcribe the 1-year history ? Or just keep the initial release, and wait until an automated releasing (and changelog update) is implemented to start transcribing history ?