diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,24 +1,126 @@
-# README
+# Welcome to Rails Tic-Tac-Toe Project
 
-This README would normally document whatever steps are necessary to get the
-application up and running.
+This is the tic tac toe game with multiple modes: play with AI, two-player mode with lots of customization, invincible mode.
 
-Things you may want to cover:
+# Demo
 
-* Ruby version
+You can try it at https://railstictactoe.herokuapp.com
 
-* System dependencies
+## Support for me
+Support this project :stuck_out_tongue_winking_eye: :pray:
+<p align="center">
+    <a href="https://www.paypal.me/tanhongit" target="_blank"><img src="https://img.shields.io/badge/Donate-PayPal-green.svg" data-origin="https://img.shields.io/badge/Donate-PayPal-green.svg" alt="PayPal buymeacoffee TanHongIT"></a>
+</p>
 
-* Configuration
+# 1. Technology
+- Ruby on Rails
 
-* Database creation
+# 2. Configuration requirements
+We are going to build the web application using:
+- Rails 6.0.3.2
+- Ruby 2.7.1
 
-* Database initialization
+# 3. Modes
 
-* How to run the test suite
+- Play Rank with AI
+- Invincible mode
+- Two-player mode
 
-* Services (job queues, cache servers, search engines, etc.)
+# 4. Runing
 
-* Deployment instructions
+### 4.1. Clone Repo
 
-* ...
+```
+$ git clone https://github.com/TanHongIT/rails-tic-tac-toe-project
+$ cd rails-tic-tac-toe-project
+```
+
+### 4.2. Bundle Install 
+
+```
+$ bundle install
+```
+
+### 4.3. Yarn Install 
+
+```
+$ yarn install
+```
+
+### 4.4. Create database with Postgresql
+
+You must change the appropriate database configuration
+
+Change configuration at _"**config/database.yml**"_ with Postgresql.
+
+```ruby
+default: &default
+  adapter: postgresql
+  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
+  timeout: 5000
+  username: railstictactoe
+  password: 1234
+  host: localhost
+
+# tutorial for ubuntu linux:
+# sudo -u postgres psql
+# create user "railstictactoe" with password '1234';  
+# create database "railstictactoe" owner "railstictactoe"; 
+
+development:
+  <<: *default
+  database: railstictactoe
+
+# Warning: The database defined as "test" will be erased and
+# re-generated from your development database when you run "rake".
+# Do not set this db to the same as development or production.
+test:
+  <<: *default
+  database: railstictactoe_test
+
+production:
+  <<: *default
+  database: railstictactoe_production
+```
+
+You must change the username, password and database name accordingly!
+
+### 4.5. run rails db:migrate
+
+```
+$ rails db:migrate
+```
+
+### 4.6. Run server 
+
+```
+$ rails s
+```
+
+Now go to http://localhost:3000
+
+# 5. Images demo
+
+#### HomePage.
+
+![Image](https://imgur.com/c64pSd3.png)
+
+#### Play Rank With AI.
+
+![Image](https://imgur.com/jCTKgTs.png)
+
+#### High Score Rank Screen.
+
+![Image](https://imgur.com/YUhkISQ.png)
+
+#### Two-player Mode.
+
+![Image](https://imgur.com/QZP0LJg.png)
+
+#### Two-player Mode customization.
+
+![Image](https://imgur.com/Vc4VkWD.png)
+
+#### Invincible mode.
+
+![Image](https://imgur.com/g7iaUkU.png)