games: Add documentation

This commit add support to Games documentation on NuttX.

Signed-off-by: Alan Carvalho de Assis <acassis@gmail.com>

Documentation/applications/games/brickmatch.rst

@@ -0,0 +1,40 @@
+==========
+Brickmatch
+==========
+
+Brickmatch is a kind puzzle game like a mix between tetris and Candy
+Crush. It is a 6x6 matrix with blocks (cells) with different colors.
+
+Your goal is to move the blocks of the board to unite three or
+more with the same color.
+
+Everytime that three of more blocks with the same color match that block
+will blink and it will be removed from the board, leaving more space
+for movements.
+
+The game starts with only the border cells filled and you can move the
+walls, floor and ceil in direction to the center of the board to make
+the cells of same color to match.
+
+Basic Test
+==========
+
+The best way to play brickmatch is using an APA102 RGB 16x16 matrix
+and Gesture sensor APDS9960. There are some board examples already
+done for this integration, all you need to do is connecting the APA102
+matrix to the right SPI pins (look your board configuration) and the
+APDS9960 to the I2C port (also connect its INT pin).
+
+If you don't have an APA102 matrix you can also play it using an LCD
+display and a digital joystick (DJOYSTICK) or the console input. 
+
+Then you can configure and compile the game to play in your board,
+i.e. for ESP32-Devkitc there is already an example using the APA102:
+
+
+    $ ./tools/configure.sh esp32-devkitc:brickmatch
+    $ make -j flash ESPTOOL_PORT=/dev/ttyUSB0
+    $ minicom
+    nsh> brick
+
+That is it! Have fun!

Documentation/applications/games/index.rst

@@ -2,4 +2,17 @@
 Games
 =====
 
-- shift - Shift Game
+NuttX is not only an RTOS, it is a rich ecosystem with much fun.
+And for many people fun is related to games! So let's play!
+
+Here you will find the list of games currently supported by NuttX.
+
+An interesting fact is that originally NuttX had the Traveler game.
+It is a raycasting game that Greg Nutt developed from scratch, similar
+to Doom in many ways. That game is not part of Apache NuttX.
+
+.. toctree::
+  :maxdepth: 2
+  :caption: Contents
+
+  brichmatch.rst