Add related changes from SDL-0317 proposal

[AKalinich-Luxoft]

Added some documentation to reflect changes from the proposal: SDL Protocol Security Specification

[AKalinich-Luxoft]

@theresalech this PR is ready for Livio review

[jacobkeeler]

Left a few suggestions. Also, it might be worth creating a subsection for security-related pages in the guides, which RPC Encryption could go under as well.

docs/Security/Protected Services
docs/Security/RPC Encryption

[AKalinich-Luxoft]

Left a few suggestions. Also, it might be worth creating a subsection for security-related pages in the guides, which RPC Encryption could go under as well.

docs/Security/Protected Services
docs/Security/RPC Encryption

@jacobkeeler I moved these two categories to a separate sub-folder in 40447ee

[jacobkeeler]

Also, you will need to update config.json to make these pages appear in the dev portal.

In place of:

        {
            "name":"RPC Encryption"
        },

you would put:

        {
            "name":"Security",
            "navigation":[
                {
                    "name":"Protected Services"
                },
                {
                    "name":"RPC Encryption"
                }
            ]
        },

[AKalinich-Luxoft]

Also, you will need to update config.json to make these pages appear in the dev portal.

In place of:

        {
            "name":"RPC Encryption"
        },

you would put:

        {
            "name":"Security",
            "navigation":[
                {
                    "name":"Protected Services"
                },
                {
                    "name":"RPC Encryption"
                }
            ]
        },

@jacobkeeler thank you for mentioning this file. Updated in 250cf04