chore: added some contents to readme of example folder

example/README.md

@@ -1,4 +1,59 @@
-#### Examples
+# Profile Example
+
+Basic example of how to signup/ login using Supabase auth and read and write from your Supabase database. 
+## SQL
+
+You can run the following SQL from your SQL editor of your Supabase console to get started. 
+
+```sql
+-- Create a table for Public Profiles
+create table profiles (
+  id uuid references auth.users not null,
+  updated_at timestamp with time zone,
+  username text unique,
+  avatar_url text,
+  website text,
+
+  primary key (id),
+  unique(username),
+  constraint username_length check (char_length(username) >= 3)
+);
+
+alter table profiles
+  enable row level security;
+
+create policy "Public profiles are viewable by everyone." on profiles
+  for select using (true);
+
+create policy "Users can insert their own profile." on profiles
+  for insert with check (auth.uid() = id);
+
+create policy "Users can update own profile." on profiles
+  for update using (auth.uid() = id);
+
+-- Set up Realtime!
+begin;
+  drop publication if exists supabase_realtime;
+  create publication supabase_realtime;
+commit;
+alter publication supabase_realtime
+  add table profiles;
+
+-- Set up Storage!
+insert into storage.buckets (id, name)
+  values ('avatars', 'avatars');
+
+create policy "Avatar images are publicly accessible." on storage.objects
+  for select using (bucket_id = 'avatars');
+
+create policy "Anyone can upload an avatar." on storage.objects
+  for insert with check (bucket_id = 'avatars');
+
+create policy "Anyone can update an avatar." on storage.objects
+  for update with check (bucket_id = 'avatars');
+```
+
+## Other Examples
 
 - Flutter user management: https://github.com/supabase/supabase/tree/master/examples/flutter-user-management
 - Extended flutter user management with web support, github login, recovery password flow: https://github.com/phamhieu/supabase-flutter-demo