feat: Add link to public wiki
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Code development platform for open source projects from the European Union institutions
Enjoy the new, streamlined front page for code.europa.eu - the central hub for EU institution's open source software. For those already logged in - visit it here: about.code.europa.eu
Add link to public wiki in the template readme.
For further information about the platform and support, please see https://code.europa.eu/info/about