Added ReadFromFile cpp method.

Added test.

Author: neogeek

includes/RhythmGameUtilities/File.hpp

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <fstream>
+#include <iostream>
+#include <sstream>
+#include <string>
+
+namespace RhythmGameUtilities
+{
+
+std::string ReadFromFile(const char *path)
+{
+    std::ifstream file(path);
+
+    if (!file)
+    {
+        std::cerr << "Failed to open " << path << "." << std::endl;
+
+        return "";
+    }
+
+    return std::string((std::istreambuf_iterator<char>(file)),
+                       std::istreambuf_iterator<char>());
+}
+
+} // namespace RhythmGameUtilities

tests/Mocks/test.txt

@@ -0,0 +1 @@
+Hello, world!

tests/RhythmGameUtilities/File.cpp

@@ -0,0 +1,20 @@
+#include <cassert>
+#include <iostream>
+
+#include "RhythmGameUtilities/File.hpp"
+
+using namespace RhythmGameUtilities;
+
+void testReadFromFile()
+{
+    assert(ReadFromFile("./tests/Mocks/test.txt") == "Hello, world!\n");
+
+    std::cout << ".";
+}
+
+int main()
+{
+    testReadFromFile();
+
+    return 0;
+}