chore: filled in project structure

Added some example basic files containing a functioning /message
endpoint which logs the received message to INFO.

ref: N25B-144

src/control_backend/main.py

@@ -0,0 +1,36 @@
+# External imports
+import contextlib
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+import logging
+
+# Internal imports
+from control_backend.api.v1.router import api_router
+from control_backend.core.config import settings
+
+logger = logging.getLogger(__name__)
+logging.basicConfig(level=logging.INFO)
+
+@contextlib.asynccontextmanager
+async def lifespan(app: FastAPI):
+    logger.info("%s starting up.", app.title)
+    
+    yield
+    
+    logger.info("%s shutting down.", app.title)
+    
+
+# if __name__ == "__main__":
+app = FastAPI(title=settings.app_title, lifespan=lifespan)
+app.include_router(api_router, prefix="") # TODO: make prefix /api/v1
+
+# This middleware allows other origins to communicate with us
+app.add_middleware(
+    CORSMiddleware, # https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS
+    allow_origins=[settings.ui_url.unicode_string()], # address of our UI application
+    allow_methods=["*"], # GET, POST, etc.
+)
+
+@app.get("/")
+async def root():
+    return {"status": "ok"}