add game plan and assets for background

TODO.org

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+#+TITLE: Flappy Ball
+* Flappy Ball
+
+A flappy bird clone to get experience with Common Lisp and game development.
+
+
+* Game Plan [6/14]
+- [X] Create bird, well, ball
+- [X] Add physics for ball movement
+- [X] Add inputs on key and mouse clicks
+- [X] Add pipes
+- [X] Scroll pipes
+- [X] Detect collisions
+- [ ] Add background
+- [ ] Create random pipes 
+- [ ] Add goal after last pipe
+- [ ] Create state machine to manage start/play/finish
+- [ ] Create different levels
+- [ ] Add scores
+- [ ] Add high scores
+- [ ] Package for Mac/Linux/(Windows?)
+
+