Add scripts to generate certificate and add it to the macOS Keychain and iOS Keychain

[subdan]

trafficstars

Scripts/generate-self-signed-certificate.sh — generates self signed certificate (root-ca.pem) using Scripts/cert.config config file. Scripts/extract-certificate-from-keychain.sh — extracts certificate from the local macOS Keychain Scripts/add-certificate-to-system-keychain.sh — adds a certificate to the local macOS Keychain Scripts/add-certificate-to-ios-keychain.sh — adds a certificate to the booted iOS Simulator

Closes #41

[Alexander-Ignition]

I checked like this

import NIOSSL

// ...

try app.http.server.configuration.tlsConfiguration = .makeServerConfiguration(
    certificateChain: NIOSSLCertificate.fromPEMFile("cert.pem").map { .certificate($0) },
    privateKey: .file("cert.key")
)