Provide script to import certificate as base64-string into Azure Key Vault

[mbraekman]

Is your feature request related to a problem? Please describe.
Provide a script to help with uploading a certificate as a secret into Azure Key Vault.

Describe the solution you'd like
Read the provided certificate as byte-array to convert to base64 before uploading with multi-line support to Azure Key Vault.

Example of such a script can be found here:
https://github.com/mbraekman/Powershell/blob/master/Azure/Create%20KeyVault%20Secret%20-%20Certificate%20as%20Base64.ps1

[stijnmoreels]

Maybe we can provide an extra argument to the already existing #17 script for the encoding of the to-be-imported file instead of two seperate commands? @mbraekman

[mbraekman]

While I'm not opposed to that suggestion, I think we should create a seperate one, to keep in line with the user-friendliness setup where we split up enable/disable or start/stop scripts as well.