Add Readme

Author: JaneSjs

blogpost-apps/local-first-form-builder/README.md

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+# SurveyJS Form Builder – Offline Preact Demo
+
+This is a lightweight demo showcasing how to use the [SurveyJS Form Builder](https://surveyjs.io/open-source) in an **offline-first Preact** setup.
+
+## Features
+
+- How to self-host the SurveyJS Form Builder
+- How to work completely offline (no internet required)
+- How to save/load survey JSON and theme to/from `localStorage`
+- How to sync survey data manually when needed
+
+## Related Blog Post  
+Read the full tutorial here: [Build Truly Offline Web Forms with SurveyJS](https://surveyjs.io/stay-updated/blog/local-fist-form-builder#try-the-demo-offline-surveyjs-creator).
+
+## Tech Stack
+
+- Preact
+- SurveyJS Form Library
+- LocalStorage API
+
+## How to Run
+
+1. Clone this repository
+2. Open `index.html` directly in a browser — no server required
+
+This demo is static and runs 100% in the browser.