vss-extension.json

 {
        "manifestVersion": 1,
        "id": "send-custom-email",
        "version": "2.0.3",
        "name": "Send Custom Email",
        "description": "Send your own custom release email",
        "publisher": "NavinDhananshan",
        "targets": [
            {
                "id": "Microsoft.VisualStudio.Services"
                }
            ],
        "icons": {
            "default": "images/icon.png"
         },
        "contributions": [
            {
                "id": "navin.sendcustomemail",
                "type": "ms.vss-web.hub",
                "description": "Adds an 'Email' hub to the build/ release hub group.",
                "targets": [
                    "ms.vss-build-web.build-release-hub-group"
                    ],
                "properties": {
                    "name": "Email",
                    "order": 99,
                    "uri": "send-email.html"
                }
            }
        ],
        "scopes": [
            "vso.work"
        ],
        "categories": [
            "Build and release"
        ],
        "branding": {
            "color": "rgb(53, 152, 217)",
            "theme": "light"
        },
        "content": {
            "details": {
                "path": "README.md"
            }
        },
        "links": {
            "getstarted": {
                "uri": "https://github.com/dhananshan/Send-Custom-Email"
            },
            "support": {
                "uri": "https://github.com/dhananshan/Send-Custom-Email/issues"
            }
        },
        "repository": {
            "type": "git",
            "uri": "https://github.com/dhananshan/Send-Custom-Email"
        },
        "galleryFlags": [
            "Public"
        ],
        "files": [
            {
                "path": "send-email.html", "addressable": true
            },
            {
                "path": "content", "addressable": true
            },
            {
                "path": "node_modules", "addressable": true
            },
            {
                "path": "images/icon.png", "addressable": true
            }
        ]
    }