Add stylelint and configure eslint to add custom plugin.

- Split up main.ts into multiple files.

.eslintrc.js

@@ -0,0 +1,22 @@
+module.exports = {
+	"root": true,
+	"extends": [
+		"plugin:obsidian/recommended"
+	],
+	"parser": "@typescript-eslint/parser",
+	"parserOptions": {
+		"project": "./tsconfig.json",
+		"ecmaVersion": 2020,
+		"sourceType": "module"
+	},
+	"env": {
+		"browser": true,
+		"node": false
+	},
+	"plugins": [
+		"obsidian"
+	],
+	"rules": {
+
+	}
+}