Add basic FastAPI structure and random string generator

.gitignore

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+app/__pycache__
+venv/

README.md

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-# url-shortener
+# URL-shortener
-Url-shortener project to showcase python use
+URL-shortener project to showcase python use
+
+## Run locally
+```bash
+uvicorn app.main:app --reload
+```
+Then check: 
+http://127.0.0.1:8000 

app/main.py

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+from fastapi import FastAPI, HTTPException
+from fastapi.responses import RedirectResponse
+
+app = FastAPI()
+
+@app.get("/")
+def home():
+    return {"message": "URL Shortener API"}
+    

app/utils.py

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+import string
+import random
+
+def generate_short_code(length=6):
+    characters = string.ascii_letters + string.digits
+    return ''.join(random.choice(characters) for _ in range(length))
+