docs: add README to user management example

Author: grdsdev

Examples/UserManagement/README.md

@@ -0,0 +1,66 @@
+# Supabase Swift User Management
+
+This repo is a quick sample of how you can get started building apps using Swift and Supabase. You can find a step by step guide of how to build out this app in the [Quickstart: Swift guide](https://supabase.io/docs/guides/with-swift). 
+
+This repo will demonstrate how to:
+- Sign users in with Supabase Auth using [magic link](https://supabase.io/docs/reference/dart/auth-signin#sign-in-with-magic-link)
+- Store and retrieve data with [Supabase database](https://supabase.io/docs/guides/database)
+- Store image files in [Supabase storage](https://supabase.io/docs/guides/storage)
+
+![Supabase User Management example](supabase-swift-demo.png)
+
+## Getting Started
+
+Before running this app, you need to create a Supabase project and copy [your credentials](https://supabase.io/docs/guides/with-flutter#get-the-api-keys) to `Supabase.swift`. 
+
+Run the application in a device or simulator using Xcode.
+
+## Database Schema
+
+```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' );
+```