Update README

[henriqueleite42]

What this PR introduces?

Add Discord bagde

PR Checklist

Please check if your PR fulfills the following requirements:

• I have followed GitFlow pattern to create the branch
• I have added all the plugins and configs as dependencies
• I have tested the updates using yarn lk, yarn link @techmmunity/eslint-config and checking in another project if it works

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[x] Documentation update
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Dependencies update
[ ] CI/CD related changes

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information (Prints, details, etc)

[github-actions]

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