Update README with installation and configuration documentation#6

YumeChaan wants to merge 2 commits into

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INTGRTNS-506-Fix-WHMCS-SSL-module-documentation-and-integration-issuesopenprovider/Openprovider-WHMCS-SSL:INTGRTNS-506-Fix-WHMCS-SSL-module-documentation-and-integration-issuesCopy head branch name to clipboard