Add extension https://github.com/riknoll/arcade-rpg

Fixes #48

Author: UnsignedArduino

content/extensions/055-meeeeeeeep1---Info-plus.md

@@ -6,4 +6,4 @@ links:
       https://forum.makecode.com/t/makecode-arcade-mini-extentions-functions/19968?u=unsignedarduino
 ---
 
-This extension expands the `INFO` category, giving you the ability to show/hide the stats, change the life image and customize the stat colors. Adds blocks to the `Info` category.
+This extension expands the `Info` category, giving you the ability to show/hide the stats, change the life image and customize the stat colors. Adds blocks to the `Info` category.

content/extensions/078-riknoll---arcade-sprite-tilemaps.md

@@ -6,4 +6,4 @@ links:
       https://forum.makecode.com/t/extension-arcade-sprite-tilemaps/31444?u=unsignedarduino
 ---
 
-This extension allows you to set tilemaps for individual sprites, so tile overlap events are fired and those sprites will interact with walls while also allowing you to use the normal overlap and wall hit event blocks for your sprite! Although they do not get drawn to the screen, they can still be useful for separating the actual tilemap from the game logic, etc. Heed the warning that "this engine replaces the physics engine, so it is not compatible with any other extension that overwrites the physics engine." This extension adds a Sprite Tilemaps category.
+This extension allows you to set tilemaps for individual sprites, so tile overlap events are fired and those sprites will interact with walls while also allowing you to use the normal overlap and wall hit event blocks for your sprite! Although they do not get drawn to the screen, they can still be useful for separating the actual tilemap from the game logic, etc. Heed the warning that "this engine replaces the physics engine, so it is not compatible with any other extension that overwrites the physics engine." This extension adds a `Sprite Tilemaps` category.

content/extensions/079-riknoll---arcade-rpg.md

@@ -0,0 +1,5 @@
+---
+repo: "https://github.com/riknoll/arcade-rpg"
+---
+
+The large `arcade-rpg` extension adds the category `Rpg` to the toolbox, with seven subcategories `Characters`, `Equations`, `UI`, `Entity`, `Data`, `Status`, and `HUD`, all designed to streamline RPG game development. Although this extension appears to be fully featured, there does not appear to be any documentation available, so use at your own risk.