add npx markdowndb init CLI script that will bootstrap the config file

mddb.config.js

@@ -1,4 +1,3 @@
 export default {
-    customFields: [
-    ]
-}
+  customFields: []
+};

src/bin/index.js

@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 import * as path from 'path';
+import { promises as fs } from 'fs';
 import { MarkdownDB } from "../lib/markdowndb.js";
 
 async function loadConfig(configFilePath) {
@@ -15,10 +16,27 @@ async function loadConfig(configFilePath) {
   }
 }
 
+async function initConfigFile(configFilePath = "mddb.config.js") {
+  const normalizedPath = path.resolve(configFilePath);
+  const configFileContent = `export default {\n  customFields: []\n};\n`;
+
+  try {
+    await fs.writeFile(normalizedPath, configFileContent);
+    console.log(`Configuration file created at ${normalizedPath}`);
+  } catch (error) {
+    throw new Error(`Error creating configuration file at ${normalizedPath}: ${error.message}`);
+  }
+}
+
 // TODO get these from markdowndb.config.js or something
 const dbPath = "markdown.db";
 const ignorePatterns = [/Excalidraw/, /\.obsidian/, /DS_Store/];
-const [contentPath, configFilePath] = process.argv.slice(2);
+const [command, contentPath, configFilePath] = process.argv.slice(2);
+
+if (command === 'init') {
+  await initConfigFile(configFilePath);
+  process.exit();
+}
 
 if (!contentPath) {
   throw new Error("Invalid/Missing path to markdown content folder");