feat: initialize markr nostr bookmark client

- Add project structure with TypeScript, React, and Vite
- Implement nostr authentication using browser extension (NIP-07)
- Add NIP-51 compliant bookmark fetching and display
- Create minimal UI with login and bookmark components
- Integrate applesauce-core and applesauce-react libraries
- Add responsive styling with dark/light mode support
- Include comprehensive README with setup instructions

This is a minimal MVP for a nostr bookmark client that allows users to
view their bookmarks according to NIP-51 specification.

node_modules/cross-spawn/index.js

@@ -0,0 +1,39 @@
+'use strict';
+
+const cp = require('child_process');
+const parse = require('./lib/parse');
+const enoent = require('./lib/enoent');
+
+function spawn(command, args, options) {
+    // Parse the arguments
+    const parsed = parse(command, args, options);
+
+    // Spawn the child process
+    const spawned = cp.spawn(parsed.command, parsed.args, parsed.options);
+
+    // Hook into child process "exit" event to emit an error if the command
+    // does not exists, see: https://github.com/IndigoUnited/node-cross-spawn/issues/16
+    enoent.hookChildProcess(spawned, parsed);
+
+    return spawned;
+}
+
+function spawnSync(command, args, options) {
+    // Parse the arguments
+    const parsed = parse(command, args, options);
+
+    // Spawn the child process
+    const result = cp.spawnSync(parsed.command, parsed.args, parsed.options);
+
+    // Analyze if the command does not exist, see: https://github.com/IndigoUnited/node-cross-spawn/issues/16
+    result.error = result.error || enoent.verifyENOENTSync(result.status, parsed);
+
+    return result;
+}
+
+module.exports = spawn;
+module.exports.spawn = spawn;
+module.exports.sync = spawnSync;
+
+module.exports._parse = parse;
+module.exports._enoent = enoent;