doc: update readme

Author: Asudy

README.md

@@ -1,2 +1,18 @@
-# scoreboardHelper
-A Minecraft mana9er plugin for granting in-game Scoreboard access to players.
+# mc-scoreboardHelper
+A Minecraft [mana9er](https://github.com/mana9er/mana9er-core) plugin for granting in-game *sidebar scoreboard* access to players.
+
+## Functionalities
+
+### For Players
+
+1. List all visible scoreboards.
+2. View a certain scoreboard for a (fixed) period of time.
+
+### For Server OPerators
+
+1. Toggle scoreboard cycling.
+2. Register / Remove "visible" scoreboards.
+3. Register / Remove scoreboards for cycling.
+4. Set scoreboard cycle interval.
+5. Set duration for temporal viewing.
+