Update README.md (#170)

README.md

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-# README
+# Hensei API
 
-This README would normally document whatever steps are necessary to get the
-application up and running.
+## Project Overview
 
-Things you may want to cover:
+Hensei is a Ruby on Rails API for managing Granblue Fantasy party configurations, providing comprehensive tools for team building, character management, and game data tracking.
 
-* Ruby version
+## Prerequisites
 
-* System dependencies
+- Ruby 3.3.7
+- Rails 8.0.1
+- PostgreSQL
+- AWS S3 Account (for image storage)
 
-* Configuration
+## System Dependencies
 
-* Database creation
+- Ruby version manager (rbenv or RVM recommended)
+- Bundler
+- PostgreSQL
+- Redis (for background jobs)
+- ImageMagick (for image processing)
 
-* Database initialization
+## Initial Setup
 
-* How to run the test suite
+### 1. Clone the Repository
 
-* Services (job queues, cache servers, search engines, etc.)
+```bash
+git clone https://github.com/your-organization/hensei-api.git
+cd hensei-api
+```
 
-* Deployment instructions
+### 2. Install Ruby
 
-* ...
+Ensure you have Ruby 3.3.7 installed. If using rbenv:
+
+```bash
+rbenv install 3.3.7
+rbenv local 3.3.7
+```
+
+### 3. Install Dependencies
+
+```bash
+gem install bundler
+bundle install
+```
+
+### 4. Database Configuration
+
+1. Ensure PostgreSQL is running
+2. Create the database configuration:
+
+```bash
+rails db:create
+rails db:migrate
+```
+
+### 5. AWS S3 Configuration
+
+Hensei requires an AWS S3 bucket for storing images. Configure your credentials:
+
+```bash
+EDITOR=vim rails credentials:edit
+```
+
+Add the following structure to your credentials:
+
+```yaml
+aws:
+  s3:
+    bucket: your-bucket-name
+    access_key_id: your-access-key
+    secret_access_key: your-secret-key
+    region: your-aws-region
+```
+
+### 6. Run Initial Data Import (Optional)
+
+```bash
+rails data:import
+```
+
+### 7. Start the Server
+
+```bash
+rails server
+```
+
+## Environment Variables
+
+While most configurations use Rails credentials, you may need to set:
+
+- `DATABASE_URL`
+- `RAILS_MASTER_KEY`
+- `REDIS_URL`
+
+## Performance Considerations
+
+- Use Redis for caching
+- Background jobs managed by Sidekiq
+- Ensure PostgreSQL is optimized for full-text search
+
+## Security
+
+- Always use `rails credentials:edit` for sensitive information
+- Keep your `master.key` secure and out of version control
+- Regularly update dependencies
+
+## Deployment
+
+Recommended platforms:
+- Railway.app (We use this)i98-i
+- Heroku
+- DigitalOcean App Platform
+
+Deployment steps:
+1. Precompile assets: `rails assets:precompile`
+2. Run migrations: `rails db:migrate`
+3. Start the server with a production-ready web server like Puma
+
+## Troubleshooting
+
+- Ensure all credentials are correctly set
+- Check PostgreSQL and Redis connections
+- Verify AWS S3 bucket permissions
+
+## License
+
+## License
+
+This project is licensed under the GNU General Public License v3.0 (GPL-3.0-only) with additional non-commercial restrictions.
+
+Key points:
+- You are free to use and modify the software for non-commercial purposes
+- Any modifications must be shared under the same license
+- You must provide attribution to the original authors
+- No warranty is provided
+
+See the LICENSE file for full details.
+
+## Contact
+
+For support, please open an issue on the GitHub repository.