Task 1 is JSON to XML Converter and Task 2 is Digital signature

The application generates a self-signed X.509 certificate using the BouncyCastle security provider.

It uses RSA key pair with keysize 2048 bits.

As subject/Issuer is used: CN = MarosB.

Validity is set to 1 year.

Signature algorithm is SHA256withRSA.

Generated XML files are signed using the generated private key.

The XML file is not modified and signed file is stored in a separate `.signed` file and encoded in Base64.

Example of input/output files:
    From input.json to input.xml and input.signed