Added $(game) variable (#5)

Co-authored-by: Styler <styler@streamelements.com>

Author: c4ldas

docs/chatbot/variables/game.md

@@ -0,0 +1,26 @@
+---
+id: game
+tags:
+  - chatbot
+  - variable
+---
+
+# $(game)
+
+Displays the current game
+
+#### Parameters
+
+- `username` (optional): The username of the account you want to check. If no username is provided, the command will check the game of the current channel.
+
+#### Example Input
+
+```
+${game}
+```
+
+#### Example Output
+
+```
+Valorant
+```