add readme + added day5

day5/day.cpp

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+#include <fstream>
+#include <iostream>
+#include <vector>
+int main() {
+  std::ifstream inputfile("input");
+  std::string input;
+
+  int res = 0;
+  if (!inputfile.is_open()) {
+    std::cerr << "Could not open the file" << std::endl;
+    return ENOENT;
+  }
+  std::string line;
+  std::vector<std::vector<char>> wordsearch;
+
+  while (std::getline(inputfile, line)) {
+  }
+}

readme.md

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+# My advent of code 2024 solutions
+
+> [!NOTE]\
+> If something does not work try removing empty line at the end of the input