fix: update user placeholder for create

src/pages/create/index.tsx

@@ -930,7 +930,7 @@ export const CreatePage = () => {
             <div className={styles.flexWrap}>
               <div className={styles.inputWrapper}>
                 <TextField
-                  placeholder="User (nip05 / npub)"
+                  placeholder="Add user"
                   value={userInput}
                   onChange={(e) => setUserInput(e.target.value)}
                   onKeyDown={handleInputKeyDown}