Adding a CSR-based certificate

Adding a CSR-based certificate involves the following steps.

1. Creating a request file using the application web interface
2. Generating a certificate based on the request file in the certification authority
3. Downloading the generated certificate using the application web interface

   The application supports downloading individual certificates as .pem, .der, .cer, or .crt files, as well as PKCS#7 container files with the .p7b extension containing a chain of certificates.