Update readme, add .md extension to readme

[mtbChef]

Proposed changes

New README file for the repo/project, including new graphical banner.

Checklist

Before creating a PR, run through this checklist and mark each as complete:

• I have read the CONTRIBUTING document
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes

[xeioex]

Hi @mtbChef,

please squash the commits in a single one. (Keep a clean, concise and meaningful git commit history on your branch, rebasing locally and squashing before submitting a PR)

For example, while working on the feature you have 3 commit, but you plan to squash
them into the first one. And the top 2 commits are small fixes related to the initial commit.
Do the following
git rebase -i HEAD~3
In the interactive mode replace

pick 4ed2a1b Main commit
pick 7ac9a67 Commit message #2
pick e3a1b35 Commit message #3

with

pick 4ed2a1b Main commit
squash 7ac9a67 Commit message #2
squash e3a1b35 Commit message #3

After squashing, Git will open the editor again to combine the commit messages. You can edit this to reflect the new squashed commit's message.

With a new commit history, force-push the changes to your repo/branch:
git push origin update-readme -f. After the force push this PR will be updated automatically.