Added sample to show max_progress working with iterables. Updated README

samples/block_progress_bar_iterable.cpp

@@ -0,0 +1,50 @@
+#include <chrono>
+#include <indicators/block_progress_bar.hpp>
+#include <indicators/cursor_control.hpp>
+#include <thread>
+
+int main() {
+
+  // Hide cursor
+  indicators::show_console_cursor(false);
+
+  // Random list of numbers
+  std::vector<size_t> numbers;
+  for (size_t i = 0; i < 1259438; ++i) {
+      numbers.push_back(i);
+  }
+
+  using namespace indicators;
+  BlockProgressBar bar{
+    option::BarWidth{80},
+    option::ForegroundColor{Color::white},
+    option::FontStyles{
+          std::vector<FontStyle>{FontStyle::bold}},
+    option::MaxProgress{numbers.size()}
+  };
+
+  std::cout << "Iterating over a list of numbers (size = "
+            << numbers.size() << ")\n";
+
+  std::vector<size_t> result;
+  for (size_t i = 0; i < numbers.size(); ++i) {
+
+    // Perform some computation
+    result.push_back(numbers[i] * numbers[i]);
+
+    // Show iteration as postfix text
+    bar.set_option(option::PostfixText{
+      std::to_string(i) + "/" + std::to_string(numbers.size())
+    });
+
+    // update progress bar
+    bar.tick();
+  }
+
+  bar.mark_as_completed();
+
+  // Show cursor
+  indicators::show_console_cursor(true);
+
+  return 0;
+}