Add initializer script

[rubensworks]

When people start using this tool and Components.js, they should be able to initialize all the required base files.
Concretely, the following should be done:

• Add entries to package.json:

"lsd:module": "https://linkedsoftwaredependencies.org/bundles/npm/@solid/community-server",
  "lsd:components": "components/components.jsonld",
  "lsd:contexts": {
    "https://linkedsoftwaredependencies.org/bundles/npm/@solid/community-server/^1.0.0/components/context.jsonld": "components/context.jsonld"
  },
  "lsd:importPaths": {
    "https://linkedsoftwaredependencies.org/bundles/npm/@solid/community-server/^1.0.0/components/": "components/",
    "https://linkedsoftwaredependencies.org/bundles/npm/@solid/community-server/^1.0.0/config/": "config/"
  },

• Initialize empty folders and files:

components/context.jsonld
components/components.jsonld
config/