add base skin files

.eslintrc.json

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+{
+	"root": true,
+	"extends": [
+		"wikimedia/client-es6",
+		"wikimedia/jquery",
+		"wikimedia/mediawiki"
+	],
+	"rules": {
+		"compat/compat": "off",
+		"vue/no-v-html": "off"
+	}
+}

.gitignore

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+.eslintcache
+node_modules/

.stylelintrc.json

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+{
+	"extends": "stylelint-config-wikimedia",
+	"rules": {
+		"selector-max-id": null,
+		"no-descending-specificity": null
+	}
+}

i18n/en.json

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+{
+	"@metadata": {
+		"authors": [
+			"..."
+		]
+	},
+	"skinname-crystal": "Crystal",
+	"crystal-skin-desc": "A skin for Final Fantasy fansites, by Esby.",
+	"crystal-no-categories": "No categories."
+}

i18n/qqq.json

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+{
+	"@metadata": {
+		"authors": [
+			"..."
+		]
+	},
+	"skinname-crystal": "{{optional}}",
+	"crystal-skin-desc": "{{desc|what=skin|name=Crystal|url=https://www.mediawiki.org/wiki/Skin:Crystal}}",
+	"crystal-no-categories": "Message to show when no categories available"
+}

package.json

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+{
+	"name": "Crystal",
+	"private": true,
+	"scripts": {
+		"test": "npm -s run lint",
+		"lint": "npm -s run lint:js && npm -s run lint:styles && npm -s run lint:i18n",
+		"lint:fix:js": "npm -s run lint:js -- --fix",
+		"lint:fix:styles": "npm -s run lint:styles -- --fix",
+		"lint:js": "eslint --cache .",
+		"lint:styles": "stylelint \"**/*.{less,css}\"",
+		"lint:i18n": "banana-checker i18n/"
+	},
+	"devDependencies": {
+		"eslint-config-wikimedia": "0.25.1",
+		"grunt-banana-checker": "0.11.0",
+		"stylelint-config-wikimedia": "0.15.0"
+	}
+}

resources/print.less

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+/* Styles for print view and printing. */
+/* You can use CSS files or Less files depending on your preference. */
+
+/* Hide some extra stuff from print view (some of the navigation is already hidden automatically,
+but not all). */
+.mw-indicators,
+.mw-portlet-personal,
+.mw-portlet-views,
+.mw-portlet-namespaces,
+.mw-portlet-cactions,
+.mw-portlet-notifications,
+.mw-interlanguage-selector,
+.mw-portlet-lang,
+.toggle-list,
+.catlinks,
+.mw-footer,
+.mw-portlet-variants,
+form.mw-portlet,
+#toc-sticky {
+	display: none;
+}
+
+#p-logo a {
+	display: flex;
+	align-items: center;
+	column-gap: 10px;
+}

skin.json

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+{
+	"name": "Crystal",
+	"version": "1.0.0",
+	"author": [
+		"[https://skins.wmflabs.org skins.wmflabs.org v.3.0]"
+	],
+	"url": "https://www.mediawiki.org/wiki/Skin:Crystal",
+	"descriptionmsg": "crystal-skin-desc",
+	"namemsg": "skinname-crystal",
+	"type": "skin",
+	"requires": {
+		"MediaWiki": ">= 1.41.0"
+	},
+	"ValidSkinNames": {
+		"crystal": {
+			"class": "SkinMustache",
+			"args": [
+				{
+					"name": "crystal",
+					"responsive": true,
+					"toc": true,
+					"messages": [
+						"crystal-no-categories",
+						"otherlanguages",
+						"sitetitle",
+						"search",
+						"tagline"
+					],
+					"styles": [
+						"codex-styles",
+						"skins.crystal.styles"
+					],
+					"scripts": []
+				}
+			]
+		}
+	},
+	"MessagesDirs": {
+		"Crystal": [
+			"i18n"
+		]
+	},
+	"ResourceModules": {
+		"skins.crystal.styles": {
+			"class": "MediaWiki\\ResourceLoader\\SkinModule",
+			"features": {
+				"normalize": true,
+				"elements": true,
+				"content-tables": true,
+				"content-links": true,
+				"content-media": true,
+				"content-links-external": false,
+				"interface-message-box": true,
+				"interface-category": true,
+				"toc": true
+			},
+			"targets": [
+				"desktop",
+				"mobile"
+			],
+			"styles": [
+				"resources/skin.less"
+			]
+		}
+	},
+	"ResourceFileModulePaths": {
+		"localBasePath": "",
+		"remoteSkinPath": "Crystal"
+	},
+	"ResourceModuleSkinStyles": {},
+	"manifest_version": 2
+}