[Enhancement] add Plugin 📦 Installation & Upgrade info to readme#4

4-FLOSS-Free-Libre-Open-Source-Software wants to merge 1 commit intomarkbott:mastermarkbott/CertKeyProvider:masterfrom

4-FLOSS-Free-Libre-Open-Source-Software:patch-14-FLOSS-Free-Libre-Open-Source-Software/CertKeyProvider:patch-1Copy head branch name to clipboard