Initial commit: Create comprehensive Git playground

- Multi-language source code (Python, JavaScript, Java, C++, Go)
- Configuration files (JSON, YAML, INI)
- Sample data files (CSV, JSON, logs)
- Binary and media assets (PNG, SVG, PDF)
- Test files and deployment scripts
- Nested directory structure for testing Git features

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

config/database.yml

@@ -0,0 +1,40 @@
+development:
+  adapter: postgresql
+  encoding: unicode
+  database: sandbox_dev
+  pool: 5
+  username: postgres
+  password: password
+  host: localhost
+  port: 5432
+
+test:
+  adapter: postgresql
+  encoding: unicode
+  database: sandbox_test
+  pool: 5
+  username: postgres
+  password: password
+  host: localhost
+  port: 5432
+
+staging:
+  adapter: postgresql
+  encoding: unicode
+  database: sandbox_staging
+  pool: 10
+  username: <%= ENV['DB_USERNAME'] %>
+  password: <%= ENV['DB_PASSWORD'] %>
+  host: <%= ENV['DB_HOST'] %>
+  port: 5432
+
+production:
+  adapter: postgresql
+  encoding: unicode
+  database: sandbox_production
+  pool: 20
+  username: <%= ENV['DB_USERNAME'] %>
+  password: <%= ENV['DB_PASSWORD'] %>
+  host: <%= ENV['DB_HOST'] %>
+  port: 5432
+  ssl: true