renamed solutions

src/main.rs

@@ -13,9 +13,9 @@ fn main() {
         .write(true)      // Open the file for writing
         .create(true)     // Create the file if it doesn't exist
         .truncate(true)   // Clear the file if it already exists
-        .open("solution.md").expect("Cannot open or create file");
+        .open("README.md").expect("Cannot open or create file");
 
-    file.write_all(b"# Advent of code 2025\n```").expect("Cannot write to file");
+    file.write_all(b"# Advent of Code 2025\n```").expect("Cannot write to file");
 
     let exercises: Vec<(&str, fn () -> u64)> = vec![
         ("day01:A", part01a::solve),