Update README

Author: morishin

README.md

@@ -2,11 +2,18 @@
 
 This is a web app to share SQLs for data analysis from [Bdash](https://github.com/bdash-app/bdash).
 
-Bdash Server is powered by [Blitz.js](https://github.com/blitz-js/blitz).
+The features are:
+1. Share as a web page your SQL, query results and charts from Bdash client.
+1. Add descriptions to your query.
+1. Search queries of all users.
+
+![screenshot](https://user-images.githubusercontent.com/1413408/115130638-34d03e80-a02c-11eb-905c-c96154a74d67.png)
+
+Bdash Server is powered by [Blitz.js](https://github.com/blitz-js/blitz) using [Next.js](https://nextjs.org/) and [Prisma](https://www.prisma.io/).
 
 ## Setup
 
-Make `.env.local` from `.env.local.example`.
+Make your own `.env.local` from `.env.local.example` for development.
 
 ```sh
 $ cp .env.local.example .env.local
@@ -16,6 +23,7 @@ And write your own `GOOGLE_CLIENT_ID` and `GOOGLE_CLIENT_SECRET` for OAuth.
 
 You can generate OAuth web client ID by following the steps described in: https://support.google.com/workspacemigrate/answer/9222992.
 
+After that,
 - Set `http://localhost:3000` as _Authorized JavaScript origins_
 - Set `http://localhost:3000/api/auth/google/callback` as _Authorized redirect URIs_