add missing files

app/main.py

@@ -0,0 +1,11 @@
+from fastapi import FastAPI
+
+app = FastAPI()
+
+@app.get("/")
+def root():
+    return {"message": "Pozdrav svijete!", "autor": "GalicIvan"}
+
+@app.get("/health")
+def health():
+    return {"status": "ok"}