Add shorten endpoint and venv documentation

app/main.py

@@ -1,9 +1,26 @@
 from fastapi import FastAPI, HTTPException
 from fastapi.responses import RedirectResponse
+from pydantic import BaseModel
+from app.utils import generate_short_code
 
 app = FastAPI()
 
+url_store = {}
+
+class URLRequest(BaseModel):
+    url: str
+
 @app.get("/")
 def home():
     return {"message": "URL Shortener API"}
-    
+
+@app.post("/shorten")
+def shorten_url(request: URLRequest):
+    short_code = generate_short_code()
+
+    url_store[short_code] = {
+        "original_url": request.url,
+        "clicks": 0
+    }
+
+    return {"short_url": f"http://localhost:8000/{short_code}"}