make config easier to modify

.gitignore

@@ -1 +1,2 @@
-__pycache__
+__pycache__
+.env

example_dot.env

@@ -0,0 +1 @@
+APP_PORT=5000

main.py

@@ -1,9 +1,17 @@
 from fastapi import FastAPI
+from pydantic_settings import BaseSettings, SettingsConfigDict
 from routes import sso
 import uvicorn
 
+class Settings(BaseSettings):
+    port: int = 5000
+    
+    model_config = SettingsConfigDict(env_file=".env", extra="ignore")
+
+settings = Settings()
+
 app = FastAPI()
 app.include_router(sso.router, prefix="/api/v2/sso")
 
 if __name__ == '__main__':
-    uvicorn.run(app, host="0.0.0.0", port=5000)
+    uvicorn.run(app, host="0.0.0.0", port=settings.port)