init git, prettier & eslint config files

.gitignore

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+node_modules
+
+# Output
+.output
+.vercel
+.netlify
+.wrangler
+/.svelte-kit
+/build
+
+# OS
+**/.DS_Store
+Thumbs.db
+
+# Env
+.env
+.env.*
+!.env.example
+!.env.test
+
+# Vite
+vite.config.js.timestamp-*
+vite.config.ts.timestamp-*

.prettierignore

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+# Package Managers
+package-lock.json
+pnpm-lock.yaml
+yarn.lock
+bun.lock
+bun.lockb

.prettierrc

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+{
+	"useTabs": true,
+	"singleQuote": true,
+	"trailingComma": "none",
+	"printWidth": 100,
+	"plugins": ["prettier-plugin-svelte"],
+	"overrides": [
+		{
+			"files": "*.svelte",
+			"options": {
+				"parser": "svelte"
+			}
+		}
+	]
+}

eslint.config.js

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+import prettier from 'eslint-config-prettier';
+import js from '@eslint/js';
+import { includeIgnoreFile } from '@eslint/compat';
+import svelte from 'eslint-plugin-svelte';
+import globals from 'globals';
+import { fileURLToPath } from 'node:url';
+import ts from 'typescript-eslint';
+import svelteConfig from './svelte.config.js';
+
+const gitignorePath = fileURLToPath(new URL('./.gitignore', import.meta.url));
+
+export default ts.config(
+	includeIgnoreFile(gitignorePath),
+	js.configs.recommended,
+	...ts.configs.recommended,
+	...svelte.configs.recommended,
+	prettier,
+	...svelte.configs.prettier,
+	{
+		languageOptions: {
+			globals: { ...globals.browser, ...globals.node }
+		},
+		rules: { 'no-undef': 'off' }
+	},
+	{
+		files: ['**/*.svelte', '**/*.svelte.ts', '**/*.svelte.js'],
+		ignores: ['eslint.config.js', 'svelte.config.js'],
+		languageOptions: {
+			parserOptions: {
+				projectService: true,
+				extraFileExtensions: ['.svelte'],
+				parser: ts.parser,
+				svelteConfig
+			}
+		}
+	}
+);