feat: oidc-client.js based Svelte OidcComponent

follows a pattern similar to @dopry/svelte-auth0,
but uses the more standards compliant oidc-client.js
library.

.eslintrc.js

@@ -0,0 +1,20 @@
+module.exports = {
+	env: {
+		browser: true,
+		node: true,
+		es6: true,
+		'cypress/globals': true,
+	},
+	extends: ['eslint:recommended', 'plugin:cypress/recommended', 'prettier'],
+	overrides: [
+		{
+			files: '*.svelte',
+			processor: 'svelte3/svelte3',
+		},
+	],
+	parserOptions: {
+		ecmaVersion: 2019,
+		sourceType: 'module',
+	},
+	plugins: ['svelte3', 'cypress'],
+};