Add documentation on how to generate self-signed certificates

[AndreaV-Lsi]

Generating a Self-Signed Certificate for the WebSocket Server

1. Open Command Line Interface:
   o Open your command line tool (Terminal on Unix-like systems, Command Prompt or PowerShell on Windows).
2. Generate a Private Key:
   o Run the following command to create a new private key (privateKey.pem):
   o openssl genrsa -out privateKey.pem 2048
3. Create a Self-Signed Certificate:
   o openssl req -new -x509 -key privateKey.pem -out certificate.pem -days 365
   o Now, generate a self-signed certificate (certificate.pem) using the private key: o During this process, you'll be prompted to enter details like your country, state, organization name, etc. These details are used to fill out the certificate's subject field. NOTE: In the Common Name field, you MUST enter your hostname (e.g. 127.0.0.1) or you will probably get SSL errors.

Generating a Client Certificate

1. Generate a Client Private Key:
   o Use OpenSSL to generate a private key for the client. Open your command line tool and run:
   o openssl genrsa -out clientPrivateKey.pem 2048
2. Generate a Certificate Signing Request (CSR):
   o openssl req -new -key clientPrivateKey.pem -out clientCSR.csr
   o Create a CSR using the client's private key. This request will be used to generate the actual certificate. o You'll be prompted to enter details like country, state, and organization. Fill these out as required.
3. Generate the Client Certificate:
   o Now, you need to create a client certificate from the CSR. If you are using a self-signed server certificate, you can sign the client CSR with the server's private key, effectively making the server act as a CA.
   o openssl x509 -req -in clientCSR.csr -CA certificate.pem -CAkey privateKey.pem -CAcreateserial -out clientCertificate.pem -days 365
   o This command uses your previously created server certificate
   (certificate.pem) and private key (privateKey.pem) to sign the client's CSR, creating a client certificate (clientCertificate.pem).