Added a README

Author: AmauryCarrade

README.md

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+# UsefulPing
+
+An useful and lightweight `/ping` command with latency and server load, for Bukkit.
+
+```
+/ping            — displays own ping
+/ping <player>   — displays ping for this player
+
+Aliases: /lag, /latency
+```
+
+Permission: `ping.ping` (default `true`).
+
+Translated in French (see configuration file).
+
+![Preview](https://raw.carrade.eu/s/1463868237.png)