doc: modify README

Author: Asudy

README.md

@@ -1,18 +1,61 @@
 # mc-scoreboardHelper
 A Minecraft [mana9er](https://github.com/mana9er/mana9er-core) plugin for enabling in-game sidebar scoreboard cycling.
 
-## Functionalities
+## Functionalities & Usage
+
+The following shows a list of functionalities of the ***scoreboardHelper*** pulgin and their in-game usages (by sending the command to the chat box).
 
 ### For Players
 
 1. List all visible scoreboards.
+
+   ```
+   !sb list
+   ```
+
 2. View a certain scoreboard for a (fixed) period of time.
 
+   ```
+   !sb view <name>
+   ```
+
+3. Display help info.
+
+   ```
+   !sb help
+   ```
+
 ### For Server OPerators
 
 1. Toggle scoreboard cycling.
+
+   ```
+   !sb cycle <true|false>
+   ```
+
 2. Register / Remove "visible" scoreboards.
+
+   ```
+   !sb <add|rm> visible <name>
+   ```
+
 3. Register / Remove scoreboards for cycling.
+
+   ```
+   !sb <add|rm> cycle <name>
+   ```
+
 4. Set scoreboard cycle interval.
+
+   ```
+   !sb settime cycle <time_in_sec>
+   ```
+
 5. Set duration for temporal viewing.
 
+   ```
+   !sb settime view <time_in_sec>
+   ```
+
+   
+