src/vs/workbench/contrib/extensions/browser/extensionsWorkbenchService.ts/Extension/hasReadme
class Extension:	hasReadme(): boolean {
		if (this.local && this.local.readmeUrl) {
			return true;
		}

		if (this.gallery && this.gallery.assets.readme) {
			return true;
		}

		return this.type === ExtensionType.System;
	}