Update install info and readme

[rbdr/api-notation.vscode] / package.json

{
    "name": "api-notation",
    "displayName": "API Notation",
    "description": "Syntax Highlighting for API notation",
    "publisher": "rbdr",
    "version": "0.2.1",
    "engines": {
        "vscode": "^1.30.0"
    },
    "categories": [
        "Programming Languages"
    ],
    "repository": {
        "type": "git",
        "url": "https://gitlab.com/rbdr/api-notation.vscode.git"
    },
    "contributes": {
        "languages": [
            {
                "id": "api-notation",
                "aliases": [
                    "API Notation",
                    "api-notation"
                ],
                "extensions": [
                    ".api"
                ],
                "configuration": "./language-configuration.json"
            }
        ],
        "grammars": [
            {
                "language": "api-notation",
                "scopeName": "source.api-notation",
                "path": "./syntaxes/api-notation.tmLanguage"
            }
        ]
    }
}