Add Flappy Bit (Flappy Bird clone)

Add a code example for the Flappy Bird-clone from Hackaday Berlin

.gitignore

@@ -2,4 +2,5 @@ compiler/examples/*.asm
 compiler/examples/*.hex
 examples/**/*.hex
 **/__pycache__/**
-*env/**
+*env/**
+!examples/simenzhor-flappy/hackadayberlin-mode.hex

examples/simenzhor-flappy/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 Simen E. Sørensen
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

examples/simenzhor-flappy/Makefile

@@ -0,0 +1,17 @@
+TARGET=flappy
+PORT?=/dev/ttyUSB0
+ASSEMBLER=../../assembler/assemble.py
+
+all: assemble program
+
+assemble: $(TARGET)
+
+$(TARGET): $(ASSEMBLER) $(TARGET).asm
+		   $(ASSEMBLER) $(TARGET).asm
+
+clean:
+	rm -f $(TARGET).hex
+
+program:
+	stty -F $(PORT) raw
+	cat $(TARGET).hex > $(PORT)

examples/simenzhor-flappy/README.md

@@ -0,0 +1,46 @@
+# Flappy Bit
+_Copyright (c) 2023 Simen E. Sørensen | [@simenzhor@mastodon.social](https://mastodon.social/@simenzhor)_
+
+-------------------------
+A Flappy Bird clone for the Supercon/Hackaday Berlin badge.
+
+## Acknowledgements
+- I have used some functions from Octavian Voicu's "General Purpose Library" in [octav-snake](../octav-snake/snake.asm). 
+  -   Octav's original library is written for a game played in portrait mode, so I have modified some functions to work better in landscape mode.
+  - I have kept Octav's original coordinate system, where x exists in the range 0-7 and y in the range 0-14. The coordinate system's origin is in the top left corner of the screen (assuming portrait mode) near the R0/PAGE+1 labels 
+
+- I have used the registry definitions from Bradon Kanyid / Rattboi in [rattboi-falldown](../rattboi-falldown/falldown.asm).
+
+- I have used the Makefile from Adam Chasen in [achasen-symbolscroll](../achasen-symbolscroll/Makefile)
+# Building
+
+To build the binary, run:
+```
+make assemble
+```
+
+To load onto the badge 
+1. Verify that the port specified in the Makefile matches yours:
+
+2. Run `make all`
+
+# Gameplay
+
+Fly past as many obstacles as possible. 
+Flap your wings to gain altitude, or let gravity pull you down towards the ground - but avoid crashing with the floor, ceiling or the obstacles you zoom past! 
+The difficulty increases as you pass by obstacles. 
+
+# Keys
+
+The LSB key in the OPERAND Y section makes the bird jump. It is labeled
+  * 1/++++
+
+After the game is over, press any key in the OPERAND Y section to restart the game.
+
+# High Score in Hackaday Berlin-Mode
+If you played the game live at Hackaday Berlin, you may know that the game became borderline impossible to play as wall number 15 spawned. I have spent a bit more time balancing the game now, so it should be more fun to play, but if you are up for an extra challenge: flash your badge with `hackadayberlin-mode.hex` which is the original hex-file I showcased at the event. 
+
+The world-record in Hackaday Berlin-mode is 19 walls and is held by [@bleeptrack@vis.social](https://vis.social/@bleeptrack)! 
+
+# High Score in Source Code-Mode
+My personal best score in the version that is published here is 23 walls, but that should be possible to beat, so toot at [@simenzhor@mastodon.social](https://mastodon.social/@simenzhor) if you manage to beat either of the high scores :D