add README

README.md

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+# Monitor
+Report website's status
+
+## Usage
+### Oneshot
+```nix
+nix run github:akr2002/monitor
+```
+### Persistent
+Add the following to your `home.nix`
+```nix
+systemd.user.timers.monitor = {
+    Install.WantedBy = [ "timers.target" ];
+    Timer = {
+        OnBootSec = "1m";
+        OnUnitActiveSec = "1m";
+        Unit = "monitor.service";
+    };
+};
+systemd.user.services.monitor = {
+    Unit = {
+        Description = "A script to monitor websites.";
+    };
+    Install = {
+        WantedBy = [ "default.target" ];
+    };
+    Service = {
+        ExecStart = "${inputs.monitor.packages.${pkgs.system}.default}/bin/monitor";
+    };
+};
+```
+Start:
+```bash
+systemctl --user start mointor.timer
+```