- Add README.md with installation instructions, architecture overview, and API examples for all SDK modules
- Refactor TelecomSDK main module to use modular API clients (SubscribersAPI, UsageAPI, PaymentAPI, RatingPlanAPI, SystemAPI, GraphQLAPI)
- Add AuthProvider class with API key and JWT token support (generate_jwt_token, validate_jwt_token methods)
- Add HTTPClient base
- Elixir: Update Elixir to 1.17, finch to 0.19, ex_doc to 0.37
- Kotlin: Update Kotlin to 2.1.0, kotlinx-coroutines to 1.10.1, kotlinx-serialization to 1.8.0, Ktor to 3.0.3
- Python: Update aiohttp to 3.10.0, websockets to 14.0.0, pydantic to 2.10.0, typing-extensions to 4.12.0
- Ruby: Update httparty to 0.23, websocket-client-simple to 0.4, json to 2.7, minitest to 5.25, rubocop to 1.72
- Rust: Update reqwest to 0.12, tokio-tungstenite
- Add TelecomSDK.MixProject with app :telecom_sdk version 1.0.0 and Elixir ~> 1.15 requirement
- Add application config with :logger in extra_applications
- Add dependencies: finch ~> 0.16 for HTTP client, jason ~> 1.4 for JSON, websockex ~> 0.4 for WebSocket, ex_doc ~> 0.27 (dev only)
- Add package metadata with MIT license and GitHub repository link
- Set start_permanent based on Mix.env() == :prod