Update readme formatting

2023/day2/README.md

@@ -23,22 +23,24 @@ from the bag (like 3 red, 5 green, 4 blue).
 
 For example, the record of a few games might look like this:
 
+```
 Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
 Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
 Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
 Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
 Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green
+```
 
 In game 1, three sets of cubes are revealed from the bag (and then put back again). The first set is 3 blue cubes and 
 4 red cubes; the second set is 1 red cube, 2 green cubes, and 6 blue cubes; the third set is only 2 green cubes.
 
-The Elf would first like to know which games would have been possible if the bag contained only 12 red cubes, 
-13 green cubes, and 14 blue cubes?
+The Elf would first like to know which games would have been possible if the bag contained **only 12 red cubes, 
+13 green cubes, and 14 blue cubes?**
 
-In the example above, games 1, 2, and 5 would have been possible if the bag had been loaded with that configuration. 
-However, game 3 would have been impossible because at one point the Elf showed you 20 red cubes at once; 
-similarly, game 4 would also have been impossible because the Elf showed you 15 blue cubes at once. If you add up the 
-IDs of the games that would have been possible, you get 8.
+In the example above, games 1, 2, and 5 would have been **possible** if the bag had been loaded with that configuration. 
+However, game 3 would have been **impossible** because at one point the Elf showed you 20 red cubes at once; 
+similarly, game 4 would also have been **impossible** because the Elf showed you 15 blue cubes at once. If you add up the 
+IDs of the games that would have been possible, you get **8**.
 
 Determine which games would have been possible if the bag had been loaded with only 12 red cubes, 13 green cubes, and 
-14 blue cubes. What is the sum of the IDs of those games?
+14 blue cubes. **What is the sum of the IDs of those games?**

2023/day2/src/main.rs

@@ -1,3 +1,9 @@
-fn main() {
-    println!("Hello, world!");
+struct Cubes {
+    red: usize,
+    blue: usize,
+    green: usize,
 }
+
+fn main() {
+    // TODO: implement
+}