feat: add shared library build and example application

app/src/main.cpp

@@ -0,0 +1,17 @@
+#include <iostream>
+
+#include "logger.hpp"
+
+int main() {
+  logger::Logger logger("app.log", logger::LogLevel::info());
+
+  auto status = logger.writeMessage("Hello from shared library");
+
+  if (!status.isSuccess()) {
+    std::cerr << status.getError() << '\n';
+
+    return 1;
+  }
+
+  return 0;
+}