Add contributor guide and project usage docs

src/lazy_enter/config.py

@@ -0,0 +1,27 @@
+"""환경 변수 및 설정 관리."""
+
+from __future__ import annotations
+
+import os
+
+from dotenv import load_dotenv
+
+load_dotenv()
+
+
+class Config:
+    """앱 전체 설정을 담당하는 클래스."""
+
+    # Slack
+    slack_bot_token: str = os.getenv("SLACK_BOT_TOKEN", "")
+    slack_app_token: str = os.getenv("SLACK_APP_TOKEN", "")
+    allowed_user_id: str = os.getenv("SLACK_ALLOWED_USER_ID", "")
+    allowed_channel_id: str = os.getenv("SLACK_ALLOWED_CHANNEL_ID", "")
+
+    # PTY
+    default_shell: str = os.getenv("DEFAULT_SHELL", "claude")
+    pty_read_timeout: int = int(os.getenv("PTY_READ_TIMEOUT", "5"))
+
+    # Buffer
+    output_buffer_interval: float = float(os.getenv("OUTPUT_BUFFER_INTERVAL", "2.0"))
+    max_message_length: int = int(os.getenv("MAX_MESSAGE_LENGTH", "3000"))