Added main FastAPI application file

This commit adds the main FastAPI application file (app.py).
It includes an endpoint for AI video generation using ModelScope's Text-to-Video model.
Users can send a text prompt and receive a generated video.

app.py

@@ -0,0 +1,23 @@
+import os
+from fastapi import FastAPI
+import requests
+import uvicorn
+
+app = FastAPI()
+
+# API Key from Hugging Face Secrets
+API_KEY = os.getenv("HF_API_KEY")  
+API_URL = "https://api-inference.huggingface.co/models/damo-vilab/modelscope-text-to-video-synthesis"
+HEADERS = {"Authorization": f"Bearer {API_KEY}"}
+
+@app.get("/")
+def home():
+    return {"message": "Welcome to AI Video Generator!"}
+
+@app.get("/generate_video/")
+def generate_video(prompt: str):
+    response = requests.post(API_URL, headers=HEADERS, json={"inputs": prompt})
+    return response.json()
+
+if __name__ == "__main__":
+    uvicorn.run(app, host="0.0.0.0", port=7860)