docs: add TECH_STACK.md (#4883)

TECH_STACK.md

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+# Coolify Technology Stack
+
+## Frontend
+
+-   Vue.js
+-   Tailwind CSS
+-   Monaco Editor (Code editor component)
+-   XTerm.js (Terminal component)
+-   Livewire (Reactive components)
+
+## Backend
+
+-   Laravel (PHP Framework)
+-   PostgreSQL (Database)
+-   Redis (Caching & Real-time features)
+-   WebSocket (Real-time communication)
+
+## DevOps & Infrastructure
+
+-   Docker
+-   Docker Compose
+-   Node.js (for some tooling)
+-   Vite (Build tool)
+
+## Languages
+
+-   PHP
+-   JavaScript/TypeScript
+-   HTML/CSS
+-   Shell/Bash scripts
+-   YAML
+-   JSON