Feat: Add concise project README

README.md

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+# 4ev.link
+
+A simple, permanent URL shortener built on Cloudflare Workers, D1, and KV.
+
+## Features
+
+- Custom slugs & user accounts.
+- Fast redirects using Cloudflare's edge network.
+- Secure with reCAPTCHA.
+
+## Deployment
+
+1.  Clone this repository.
+2.  Configure secrets in your Cloudflare dashboard:
+    -   `RECAPCHA_KEY`: Your Google reCAPTCHA v2 secret key.
+    -   Bind a D1 database as `D1_EV`.
+    -   Bind a KV namespace as `KV_EV`.
+3.  Deploy with `wrangler deploy`.